JP2007105111A - Sleeping state detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect a prescribed period (first stage, middle stage and late stage) of a REM (Rapid Eye Movement) period from the heart rate of a sleeping person. <P>SOLUTION: The sleeping state detector is provided with a body movement sensor for measuring the body movement of the sleeping person and a circuit unit (30). The circuit unit (30) is provided with a heart rate deriving part (32), a periodic component extraction part (34), a standard deviation calculation part (35), a REM period deriving part (41) and a REM prescribed period detection part (42). The heart rate deriving part (32) derives the heart rate baseline of one minute from the signals of the body movement sensor, and the periodic component extraction part (34) extracts periodic components corresponding to ultradian rhythm from the heart rate baseline. The REM period deriving part (41) derives a sleeping period during which the standard deviation of every 10 minutes of the heart rate baseline calculated by the standard deviation calculation part (35) becomes higher 20% as the REM period, and the REM prescribed period detection part (42) detects the prescribed period of the REM period on the basis of the change of the periodic components. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

    The present invention relates to a sleep state detection apparatus that detects a predetermined period of a REM period.

    Conventionally, during human sleep, it is known that the REM period of shallow sleep and the non-REM period of deep sleep are alternately repeated. During this REM period, it is known that the dispersion of ecological information values such as heart rate becomes large, and a device that detects the REM period and non-REM period during sleep using such fluctuation of the ecological information value Has been studied (for example, Patent Document 1).

    In Patent Document 1, a variation index indicating a variation tendency of a sleep state is calculated by linearly combining an increment of a biological information value such as a sleeper's pulse rate and respiratory rate and a standard deviation of the biological information value. Describes a device that detects a sleep state with a large sleeping period as a REM period and a small sleeping period as a non-REM period.

In this way, by detecting the REM period and the non-REM period, the sleeper is notified of the wake-up in the REM period, and the comfort of the sleeper is improved, or the sleep depth is increased in the non-REM period. As well as letting you get deep sleep.
JP 3-41926

    By the way, in the sleep state detection apparatus of the above-mentioned Patent Document 1, the REM period is simply detected, and the detected REM period is any period of the REM period (first period (F), intermediate period (M), There was a problem that it was not possible to determine whether it was late (L).

    As a result, using the sleep state device, for example, in order to improve the awakening comfort of a sleeping person, the wake-up notification period is from one hour before the scheduled wake-up time to the scheduled wake-up time. When waking up is notified when there is detected, there is the following problem. The predetermined period of the REM period when the sleeper is most comfortable and the REM period varies from person to person. For example, when the sleeper's awakening is most comfortable during the first REM period (F), the intermediate period of the REM period When waking up in (M) or later (L), there is a problem that a more comfortable awakening cannot be obtained. Also, if the sleeper's awakening is most comfortable in the latter part of the REM period (L), not only the most comfortable awakening can be obtained by detecting the first part of the REM period (F) and notifying the wakeup, There was a problem that the bedtime was notified to the sleeping person at an unnecessarily earlier time than the scheduled wake-up time.

    The present invention has been made in view of such points, and based on a standard deviation of a sleeping person's heart rate every predetermined time and a periodic component corresponding to an ultradian rhythm extracted from the heart rate, the predetermined value of the REM period is determined. It aims at providing the sleep state detection apparatus which detects a period.

    The first invention is a measuring means (2) for measuring a sleeper's heart rate, and an extracting means (34) for extracting a periodic component corresponding to the ultradian rhythm from the heart rate measured by the measuring means (2). A calculating means (35) for calculating a standard deviation for each predetermined time of the heart rate measured by the measuring means (2), and a predetermined magnitude among all the standard deviations calculated by the calculating means (35) The derivation means (41) for deriving a sleeping period equal to or greater than the reference value including the standard deviation as the REM period and the REM period derived by the derivation means (41) are extracted by the extraction means (34). Detecting means (42) for detecting a predetermined period of the REM period based on a change in the periodic component.

    In the first aspect of the invention, the measuring means (2) measures the heart rate by measuring, for example, the body movement or electrocardiogram of the sleeping person. Since it is known that the variation in heart rate becomes large in the REM period, the calculation means (35) calculates a standard deviation for every predetermined time indicating the variation in heart rate. The predetermined time is, for example, 10 minutes, and is preferably shorter than the average duration of the REM period (about 20 minutes). The deriving means (41) derives a bedtime period equal to or greater than a reference value including a standard deviation of a predetermined magnitude among the standard deviations of the heart rate calculated by the calculating means (35) as a REM period. . Here, at bedtime, it is known that the REM period accounts for about 20% and the non-REM period accounts for about 80%. Therefore, for example, the standard deviation calculated by the calculating means (35) is used in the REM period. It is a bedtime period in the top 20% or more from the largest, and this reference value is a lower limit value of the standard deviation of the bedtime period included in the top 20%.

    The extracting means (34) extracts a periodically detected signal from the heart rate measured by the measuring means (2), and extracts a period component of the ultradian rhythm. This ultradian rhythm is a biological rhythm of a human body represented by a cycle of a REM period and a non-REM period during sleep, and generally has a period of about 90 minutes, but there are individual differences. Therefore, the extraction means (34) extracts a signal detected at a period of 30 minutes to 120 minutes, for example. Then, it is estimated that the time when the extracted change of the periodic component reaches a peak is the intermediate period (M) of the REM period. In the REM period derived by the derivation means (41), the detection means (42) is based on the change of the periodic component corresponding to the ultradian rhythm extracted by the extraction means (34), and the first part of the REM period. (F), the middle period (M), and the latter period (L) are detected. In this way, not only the detection of the REM period but also the detection of which period of the REM period the REM period derived by the deriving means (41) is performed.

    According to the second to fourth aspects of the present invention, in the first aspect, in the REM period derived by the deriving unit (41), the detecting unit (42) is based on the periodic component extracted by the extracting unit (34). This is a specific example of detecting a predetermined period of the REM period.

    Specifically, according to a second aspect, in the first aspect, the detection means (42) sets the period when the change of the periodic component extracted by the extraction means (34) becomes a positive gradient to the first half of the REM period. Detect as (F).

    In a third aspect based on the first aspect, the detection means (42) determines when the change of the periodic component extracted by the extraction means (34) is a positive extreme value, M).

    In a fourth aspect based on the first aspect, the detection means (42) sets the period when the change of the periodic component extracted by the extraction means (34) has a negative gradient as the latter period (L) of the REM period. To detect.

    According to a fifth invention, in the first invention, in the wake-up notification period after the set time set before the predetermined time of the sleeper's scheduled wake-up time, the detection means (42) determines the predetermined period of the REM period. When detected, it is provided with notification means (39) for notifying the sleeping person of getting up.

    In the fifth aspect of the present invention, when the detection means (42) detects a predetermined period of the REM period in the notification period, the notification means (39) notifies the sleeping person to wake up. Comfort is improved. If the predetermined period of the REM period is set to a predetermined period in which the sleeper's awakening is most comfortable, the sleeper can surely obtain a comfortable awakening. Further, when the predetermined period of the REM period is the latter period (L) of the REM period, the sleeping person can obtain a comfortable awakening and is not notified of getting up unnecessarily quickly.

    In a sixth aspect based on the first aspect, the derivation means (41) sets the above-mentioned setting from the start of going to bed in a notification period of waking up after a set time set a predetermined time before the expected time of waking up of the sleeping person. It is configured to derive the REM period in the notification period based on the standard value of the standard deviation until the time, and when the detection means (42) detects the predetermined period of the REM period in the notification period, An informing means (39) for informing waking up is provided.

    In the sixth aspect of the invention, when the derivation means (41) derives the REM period of the notification period, the standard deviation of the predetermined size is included every time the standard deviation is calculated by the calculation means (35). It is not necessary to derive a sleeping period (for example, the highest 20% sleeping period in descending order of standard deviation) that is equal to or greater than the standard value, and can be easily derived based on the standard deviation standard value from the start of bedtime to the set time. To do. Specifically, for example, in the notification period, the deriving means (41) is a period in which the standard deviation calculated by the calculating means (35) is equal to or greater than a standard value of the standard deviation from the bedtime start to the set time. Is derived as the REM period.

    According to a seventh invention, in the fifth or sixth invention, the notification means (39) sets the wake-up time when the detection means (42) does not detect a predetermined period of the REM period before the wake-up scheduled time. It is configured to notify the sleeping person of getting up.

    In the seventh aspect of the invention, the notification means (39) notifies the sleeping person at the latest at the scheduled wake-up time in the notification period. This prevents the sleeper from going to bed even after the scheduled wake-up time.

    According to the first aspect of the invention, the REM period is derived from the standard deviation of a predetermined magnitude among the standard deviations of the heart rate every predetermined time, and the period component of the ultradian rhythm extracted from the heart rate is changed. Since the predetermined period of the REM period is detected based on the above, it is not simply detected the REM period, but in any period of the REM period (early period (F), intermediate period (M), late period (L)) It can be detected whether there is any.

    According to the second aspect of the present invention, since the first semester (F) of the REM period can be detected, a sleeper who can comfortably wake up in the first semester (F) of the REM period can get up in the first semester (F) of the REM period. It is possible to take measures such as informing the user.

    According to the third aspect of the invention, since the intermediate period (M) of the REM period can be detected, it is possible to detect the intermediate period of the REM period (M) ) Can be taken to notify the wake-up.

    According to the fourth aspect of the present invention, since the late stage (L) of the REM period can be detected, a bedtime person who becomes comfortable waking up in the late stage (L) of the REM period can get up in the late stage (L) of the REM stage. It is possible to take measures such as informing the user.

    According to the fifth aspect of the present invention, when a predetermined period of the REM period is detected in the notification period, the sleeper is notified of getting up, so that the comfort of waking the sleeper can be improved.

    Specifically, for example, when the detection means (42) detects a predetermined period of the REM period in which the sleeper is most comfortable to wake up, the wake-up is notified so as to surely improve the comfort of the sleeper. It is possible to improve the comfort of awakening of a sleeping person without notifying the wakeup unnecessarily early, by notifying the wakeup when the latter stage (L) of the REM period is detected.

    According to the sixth aspect of the invention, the deriving means (41) calculates the REM period of the notification period based on the standard value of the standard deviation from the start of bedtime to the set time. Each time the standard deviation is calculated by the means (35), a bedtime period equal to or greater than the reference value including the standard deviation of the predetermined size (for example, the bedtime period of the top 20% from the largest standard deviation) is derived. Since it is not necessary, the REM period in the notification period can be easily derived.

    According to the seventh invention, in the fifth or sixth invention, the notifying means (39) is a sleeper at a scheduled wake-up time when the detecting means (42) does not detect the REM period in the notification period. Since the notification means (39) can notify the sleeping person to wake up at the scheduled wake-up time at the latest, the notification means (39) keeps going to sleep even if the sleeping person passes the scheduled wake-up time. Can be prevented.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1 of the Invention
As shown in FIG. 1, Embodiment 1 of the present invention is a sleep state detection device (1) that detects a sleeping state of a sleeping person and notifies the sleeping person of getting up based on the detection result. The sleep state detection device (1) includes a body motion sensor (2) and a circuit unit (30).

    The body motion sensor (2) measures the heart rate from the body motion of the sleeping person and is configured as a heart rate measuring means. As shown in FIGS. 1 and 2, the body motion sensor (2) includes a pressure sensing part (21) and a pressure receiving part (22). The pressure-sensitive part (21) is laid on a mattress laid on a bed of a bedding such as a bed, and is constituted by an elongated and hollow tube, and a space is formed inside thereof. When the sleeping person lies down on the bed, pressure and vibration are transmitted to the pressure sensing part (21) along with the body movement of the sleeping person so that the internal pressure of the pressure sensing part (21) acts on the pressure receiving part (22). It is configured.

    The pressure receiving part (22) includes a casing (23) and a sensor part (24) accommodated in the casing (23). A sensor part (24) is comprised by the microphone, the pressure sensor, etc. The sensor unit (24) receives an internal pressure applied from the pressure sensing unit (21), and outputs the internal pressure as a body movement detection signal to the circuit unit (30) via the lead wire (25). A minute leak groove (26) is formed at the connection position between the pressure sensitive part (21) and the pressure receiving part (22). When the sleeper gives a strong impact to the bed, the leak groove (26) is caused by the sudden increase in internal pressure acting on the sensor unit (24), causing the sensor unit (24) to break down or a detection signal. Is to be saturated.

    As shown in FIG. 3, the circuit unit (30) includes a body movement output unit (31), a heart rate derivation unit (32), a periodic component extraction unit (34), a standard deviation calculation unit (35), A rem detection unit (36), a wake-up time setting unit (37), a notification condition setting unit (38), and a wake-up notification unit (39).

    The body motion output unit (31) modulates and outputs the detection signal output from the pressure receiving unit (22) of the body motion sensor (2) into a body motion signal in a predetermined frequency band.

    The heart rate deriving unit (32) includes a heart rate measuring unit (40) and a heart rate baseline deriving unit (33). The heart rate measurement unit (40) extracts a signal of the heart rate frequency band from the frequency band of the body motion signal output from the body motion output unit (31) by a heart rate extraction filter, and the extracted signal The average value of the heart rate per minute (hereinafter referred to as the actually measured heart rate average value) is derived from the actually measured value. The heart rate baseline deriving unit (33) removes a noise signal due to rough body movement such as turning over from the measured average heart rate value derived by the heart rate measuring unit (40), and removes it every minute. It is derived as the heart rate baseline.

    The periodic component extraction unit (34) extracts a periodically detected signal as a periodic component corresponding to the ultradian rhythm from the heartbeat baseline derived by the heartbeat baseline deriving unit (33). The extraction means is configured.

    The standard deviation calculation unit (35) calculates a standard deviation every predetermined time (for example, every 10 minutes) from the heart rate baseline derived by the heart rate baseline deriving unit (33). It is constituted by means.

    The REM detection unit (36) detects a sleep state and includes a REM period deriving unit (41) and a REM predetermined period detection unit (42). The REM period deriving unit (41) is a standard having a predetermined size (for example, the top 20% from the largest standard deviation) among the standard deviations every 10 minutes calculated by the standard deviation calculating unit (35). The bedtime including the deviation is derived as the REM period, and is configured as a deriving unit. The REM predetermined period detecting unit (42) is configured to determine a predetermined REM period based on a change in the periodic component extracted by the periodic component extracting unit (34) in the REM period derived by the REM period deriving unit (41). The period is detected, and is configured as a detection means. Specifically, the REM predetermined period detection unit (42) sets, when the change of the periodic component extracted by the periodic component extraction unit (34) is a positive gradient in the REM period as the first period (F) of the REM period. Detecting when the change of the periodic component is a positive extreme value is detected as an intermediate period (M) of the REM period, and detecting when the change of the periodic component is a negative gradient as the latter period (L) of the REM period It is configured.

    The wake-up time setting unit (37) is for setting a scheduled wake-up time (for example, 7 o'clock). The notification condition setting unit (38) sets conditions for notifying a sleeping person to wake up, and includes a notification period setting unit (44) and a REM predetermined period setting unit (45). The notification period setting section (44) sets a notification period (after 6 o'clock) for wake-up from a set time (6 o'clock) after a predetermined time (for example, 1 hour) before the scheduled wake-up time. . The REM predetermined period setting unit (44) sets a predetermined period of the REM period in which the awakening of the sleeper is most comfortable. In this way, the notification condition setting unit (38) is set to notify the sleeping person to wake up when the predetermined period of the REM period set as the notification period is detected. The setting of the wake-up time setting unit (37), the notification period setting unit (44), and the REM predetermined period setting unit (45) is set automatically or by the input of a sleeping person or the like.

    In the notification period set by the notification period setting unit (44), the wake-up notification unit (39) has a rem period set by the rem predetermined period setting unit (45) by the rem predetermined period setting unit (45). When the predetermined period is detected, the sleeping person is notified of the wake-up, and when the predetermined period of the REM period is not detected during the notification period, the sleeping person is notified of the wake-up.

-Driving action-
Next, the sleep state detection operation and the wake-up notification operation of the sleeper in the sleep state detection device (1) will be described with reference to the flowcharts of FIGS. 3 and 4 and FIG. The sleep state detection device (1) is set to simply detect a predetermined period of the REM period, or detects the predetermined period of the REM period and simply notifies the user of the wake-up time at the scheduled wake-up time. In this case, the setting of the wake-up time setting unit (37) and the notification condition setting unit (38) is canceled as appropriate.

    First, when the sleep state detection device (1) is turned on, the wake-up time setting unit (37) sets the expected wake-up time of the sleeping person, for example, at 7:00.

    Then, in the notification condition setting unit (38), a condition for notifying the sleeping person to wake up is set. Specifically, the notification period setting unit (44) sets the notification period in which the wake-up notification unit (39) notifies the sleeping person of the wake-up, for example, after the set time of 6:00 one hour before the scheduled wake-up time. . In addition, the REM predetermined period setting unit (45) causes the predetermined period of the REM period in which the wake-up notification unit (39) notifies the wake-up to, for example, the latter period (L) of the REM period in which the waking of the sleeper is most comfortable Set. It is preferable that the predetermined period of the REM period in which the sleeper's awakening is most comfortable is determined by repeatedly performing a sleep state detection operation and a wake-up notification operation described later for several days. In this way, the notification condition setting unit (38) sets the condition for the wake-up notification unit (39) to notify the sleeper of the wake-up, when the late period (L) of the REM period is detected after 6:00. Set. Note that the wake-up notification unit (39) is set to notify the wake-up at 7 o'clock after 6 o'clock if the later stage (L) of the REM period is not detected. Further, the scheduled wake-up time and the notification period are not particularly limited. If it is desired to obtain a comfortable awakening, the notification period is lengthened and the predetermined period of the REM period is surely generated in the notification period. It is preferable to do so.

    When the sleeping person lies on the pressure sensing part (21) of the body motion sensor (2), the sleeping state detection by the sleeping state detection device (1) starts to be detected.

    First, in step ST1, the body motion sensor (2) outputs a detection signal accompanying the body motion of a sleeping person, and the body motion output unit (31) outputs the detection signal to a predetermined frequency band (7.5 ± 2). .5Hz) to be modulated and output.

    Then, the process proceeds to step ST2, and the heart rate derivation unit (31) derives a one-minute heart rate baseline from the body motion signal output in step ST1. FIG. 5A is a graph in which the horizontal axis indicates the passage of time at bedtime, the vertical axis indicates the heart rate, and the dotted line (100) indicates one minute derived by the heart rate measurement unit (40). , And the solid line (200) indicates the heart rate baseline derived by the heart rate baseline deriving unit (32). In FIG. 5, for the sake of convenience, the period when the sleeping person is lying down but not sleeping and awakening is omitted, and the sleeping person is in the sleeping state for 0 minute (0:00) from the beginning of sleeping on the horizontal axis. It shows the point of time.

    In the heart rate deriving unit (32), first, the heart rate measuring unit (40) uses the heart rate extraction filter to extract the heart rate frequency from the frequency band of the body motion signal output by the body motion output unit (31). A band (1.4 ± 0.6 Hz) signal is extracted, and a one-minute measured heart rate average value is derived. The actually measured heart rate average value is derived from the actual measured value of the frequency signal as it is as the heart rate, and thus includes noise due to rough body movement such as turning over, which appears on the spike-like protrusions indicated by the dotted line (100). .

    Therefore, the heart rate baseline deriving unit (32) uses the actual measured heart rate average value derived by the heart rate actual measuring unit (40) to relax the change in the actual measured heart rate average value with an exponential function. A heart rate baseline for the minute is derived. As the time constant used in the exponential function, different time constants are used when the measured average heart rate value is increasing and decreasing.

    Specifically, for example, when the heart rate baseline at a predetermined time is C, and the actually measured heart rate average value increases to Xi after to [min] (when Xi> C), in this embodiment, A new heart rate baseline C ′ is updated according to the following equation with a time constant τ1 of 2 [min].

C ′ = C × α + Xi (1−α)
Where α = exp (−to / τ1), τ1 = 2 [min]
On the other hand, for example, when the heart rate at a predetermined time is C and the actually measured heart rate average value decreases to Xi after to [min] (when Xi <C), in this embodiment, the time constant τ2 is A new heart rate C ′ is updated by the following equation as 3 [min].

C ′ = C × β + Xi (1−β)
Here, β = exp (−to / τ2), τ2 = 3 [min]
In this way, since the signal level relaxed by the exponential function is used as the heart rate baseline, even when the actual heart rate average value suddenly changes due to noise such as coarse body motion, the heart rate baseline is It is appropriately derived at a rate of change smaller than the rate of change of the actually measured heart rate average value. In addition, as the time constant of the exponential function, a value that is larger at the time of decrease change than at the time of increase change of the actually measured heart rate average value is used. As a result, the heart rate baseline has a relatively fast response to an increasing change in the actually measured heart rate average value, and has a relatively slow response to a decreasing change in the actually measured heart rate average value. In addition to the exponential function (1-hour delay step function), for example, a 2-hour delay step function or other functions may be used as the function for relaxing the actually measured heart rate average value.

    Next, in step ST3, the periodic component extraction unit (34) uses the heartbeat baseline derived in step ST2 and performs a filter process (for example, Chebyshev) using a bandpass filter (passband 0.25 ± 0.15 Hz). Characteristic, 8th order, ripple 0.25 dB) is performed to extract a periodic component of the heartbeat corresponding to the ultradian rhythm shown by the solid line (300) in FIG. Note that the period of the ultradian rhythm of the human body is generally a 90-minute period, but since there is an individual difference in this period, the period component that appears in 30 to 120 minutes is extracted here. Then, it is estimated that the peak of the periodic component of the ultradian rhythm shown in FIG. 5B, that is, the positive extreme value is an intermediate point in the REM period.

    Next, in step ST4, it is determined whether 10 minutes have elapsed since the start of measurement of the heart rate by the body motion sensor (2). If it is determined in ST4 that 10 minutes have elapsed since the measurement, the process proceeds to step ST5, and if it is determined that 10 minutes have not elapsed since the start of the measurement, the process returns.

    In step ST5, the standard deviation calculator (35) calculates the standard deviation of the heart rate baseline shown in the solid line (400) in FIG. The standard deviation calculating unit (35) calculates the standard deviation for the past 10 minutes every minute that the heart rate baseline deriving unit (33) derives the heart rate baseline, and N minutes ( When N is an integer of 10 or more), the standard deviation of the heart rate baseline from (N-10) minutes to N minutes after the start of bedtime is calculated.

    Next, in step ST6, it is determined whether or not the sleeper's awakening is selected to be refreshed. In this embodiment, when the late condition (L) in which the sleeper is most comfortable is detected after 6 o'clock one hour before the scheduled wake-up time, the notification condition setting unit (38) wakes up. Since the notification unit (39) notifies the sleeping person to wake up and the sleeping person is awakened, the process proceeds to step ST7. In addition, it returns, when it is not set so that awakening may be refreshed.

    Next, in step ST7, it is determined whether or not it is a notification period. If it is determined in step ST7 that the notification period has not yet been reached, the process returns. If it is determined that the notification period has been reached, the process proceeds to step ST8.

    In step ST8, the rem period deriving unit (41) of the rem detection unit (36) calculates the standard deviation for the past 10 minutes in the notification period by the calculation unit (35) every minute. Of all the standard deviations, the bedtime period that is the top 20% in descending order of standard deviation is derived as the REM period.

    In step ST9, if the current REM period is derived by the REM period deriving unit (41), the process proceeds to step ST10. Note that the sleeping period surrounded by the square in FIG. 5C indicates the REM period derived by the REM period deriving unit (41) at 6:20 during the notification period. In other words, the sleeping period surrounded by a square is the sleeping period in which the standard deviation becomes the top 20% from the largest in the order of 6:20 from the start of sleeping, and from 6 o'clock to 6:20 in the notification period The REM period has been derived. In the present embodiment, the standard deviation at the time point after 280 minutes from the start of going to bed is 6.8, which is the largest, and the highest standard deviation is in the top 20% because the standard deviation is 0.5 or more. It will be a bedtime period.

    Next, in step ST10, the setting of the rem predetermined period setting unit (45) of the notification condition setting unit (38) is determined as one of the first period (F), the intermediate period (M), or the second period (L) of the REM period. I do. In the present embodiment, when the latter period (L) of the REM period is detected within the notification period, it is set to notify the wakeup, so it is determined as the latter period (L) and the process proceeds to step ST13.

    In step ST13, if the change in the period component of the ultradian rhythm is negative gradient by the rem predetermined period detection unit (42), it is determined as the latter period (L) of the REM period, and the process proceeds to step ST14. In step ST13, when the rem predetermined period detection unit (42) does not have the negative gradient of the period component of the ultradian rhythm, it determines that it is not the latter period (L) of the REM period and returns.

    Specifically, in the present embodiment, the REM period deriving unit (41) derives the REM period from 6 o'clock at the start of the notification period, but the period of ultradian rhythm from 6 o'clock to 6:10 Since the change of the component is a positive gradient, the REM predetermined period detection unit (42) determines that the REM period from 6 o'clock to 6:10 is not the latter period (L) of the REM period. And since the change of the period component of the ultradian rhythm from 6:10 to 6:20 is a negative gradient, the REM predetermined period detection unit (42) detects the REM period from 6:10 to 6:20. It is detected as the late stage (L) of the REM period. In the present embodiment, only the detection of the latter period (L) of the REM period in the notification period is performed. However, in all the REM periods shown in FIG. 5C, the periodic component of the ultradian rhythm in FIG. A positive slope is shown as the first period (F), a positive extreme value is shown as the intermediate period (M), and a negative slope is shown as the latter period (L).

    As described above, when the late stage (L) of the REM period is detected, the wake-up notification unit (39) notifies the sleeping person of the wake-up in step ST14.

    If the late stage (L) of the REM period is not detected by 7 o'clock at the time of wake-up, the process proceeds to step ST14 when 7:00 at the time of wake-up is determined at step ST7, and the wake-up notification unit (39) is activated. Inform the sleeping person of getting up.

    When the sleeper's awakening is most comfortable in the first semester (F) of the REM period, when the first REM period (F) is detected by the REM predetermined period detector (42) in the notification period, the wakeup notification section (39) is activated and set to notify the wake-up. In this case, the process proceeds from step ST10 to step ST11, and when the change in the period component of the ultradian rhythm is a positive gradient, it is determined as the first half (F) of the REM period, and in step ST14, the wake-up notification unit (39) is activated. . Also, when the sleeper's awakening is most comfortable during the intermediate period (M) of the REM period, when the intermediate period (M) of the REM period is detected by the REM predetermined period detection unit (42) during the notification period, The process proceeds from step ST10 where the notification unit (39) is activated to notify the wake-up to step ST12, and when the change of the period component of the ultradian rhythm is a positive extreme value, the intermediate period (M) of the REM period In step ST14, the wake-up notification unit (39) is activated.

    In addition, when the user is awakened during a predetermined period of the REM period set in the REM predetermined period detection unit (42) in advance and the waking of the sleeping person is not comfortable, for example, the first period (F) of the REM period every few days. The wake-up operation is repeated between the intermediate period (M) and the latter period (L) to determine a predetermined period of the REM period in which awakening is comfortable.

-Effect of Embodiment 1-
In the sleep state detection device (1), in the REM period derived by the REM period derivation unit (41), the REM predetermined period detection unit (42) is extracted by the periodic component extraction unit (34). Since the predetermined period of the REM period is detected based on the periodic component of the rhythm, not only the determination of the REM period and the non-REM period is performed, but the predetermined period of the REM period (first period (F), intermediate period (M) , Late (L)) can be detected.

    As a result, in the present embodiment, the REM predetermined period detection unit (42) is most comfortable in waking up a sleeper in the wake-up notification period (after 6 o'clock) set by the notification condition setting unit (38). When the later stage (L) of the REM period is detected, the wake-up notification unit (39) notifies the wake-up, so that the comfort of waking up for the sleeper can be improved.

    In addition, by notifying waking up later in the REM period, it is possible to prevent the sleeping person from getting up unnecessarily quickly during the informing period. That is, in the device that notifies the wakeup when the REM period is simply detected, as shown in FIG. 5C, when the REM period derivation unit (41) detects the REM period at 6:00 when the notification period starts, the wakeup notification is performed. The bed (39) notifies the sleeping person of getting up. In this case, although the REM period continues until 6:20, the wake-up will be notified as early as 1 hour from the scheduled wake-up time of the sleeping person. In this embodiment, since it is possible to detect the latter part of the REM period, even if the first part (F) of the REM period is detected from 6 o'clock to 6:10, the wake-up is not notified and from 6:10 When the late stage (L) of the REM period is detected at 6:20, the bedtime can be notified to the sleeping person, so that the bedtime is notified to the sleeping person during the REM period and, for example, the bedtime is about 10 to 20 minutes. Can be long.

    In the present embodiment, the wake-up is notified in the later stage (L) of the REM period detected within the notification period, but the sleeper's awakening is the first period (F) or the intermediate period (M) of the REM period. When it is most comfortable, the user can be woken up when the first period (F) or the intermediate period (M) of the REM period is detected to provide the sleeper with the most comfortable awakening.

    Moreover, in this embodiment, when the late stage (L) of a REM period is not detected by the said REM predetermined period detection part (42) by 7 o'clock of a sleeper's scheduled wake-up time, the said wake-up alerting part (39) Since the wake-up is notified to the sleeping person at the scheduled wake-up time, the wake-up can be notified to the sleeping person at the scheduled wake-up time at the latest.

    The method for measuring the heart rate in the sleep state detection device (1) is not particularly limited, but since the present embodiment measures the heart rate using the body motion sensor (2), the electrocardiogram measurement, etc. This makes it possible to measure the heart rate without restraining the sleeping person without restraining the sleeping person, so that the comfort of the sleeping person at the time of sleeping is also improved. The body motion sensor (2) also detects noise including rough body motion such as turning over, but the noise can be removed by using the above-described arithmetic expression.

<< Embodiment 2 of the Invention >>
In the present embodiment, when the REM period deriving unit (41) of the first embodiment is in the wake-up notification period, each time the standard deviation is calculated by the standard deviation calculating unit (35), the standard deviation of a predetermined size is used. The standard of the REM period from the start of bedtime to the set time, which is the start of the notification period, instead of deriving the bedtime period that is greater than the reference value (in order of increasing standard deviation from the top 20%) as the REM period The REM period of the notification period is derived based on the deviation reference value.

    Specifically, in the present embodiment, step ST8 and step ST9 are different from the first embodiment as shown in the flowchart of FIG. If it is determined in step ST7 that it is the notification period, in step ST8, the REM period deriving unit (41) includes a standard deviation including a predetermined standard deviation from 0 o'clock at the start of bedtime to 6 o'clock set time. The bedtime that is greater than or equal to the value (the top 20% from the largest standard deviation) is derived as the REM period. That is, the reference value is the lower limit value (for example, 0.5) of the REM period from 0:00 to 6:00 derived by the REM period deriving unit (41). Then, in step ST9, the REM period deriving unit (41) sets the sleeping period in which the standard deviation calculated by the standard deviation calculating unit (35) in the notification period is the reference value 0.5 or more to the REM of the notification period. Derived as a period.

    In the present embodiment, the REM period deriving unit (41) is configured such that, during the notification period, the standard deviation calculated by the standard deviation calculating unit (35) is equal to or greater than a standard value of a standard deviation from the bedtime start to the set time. Since the bedtime period that becomes the REM period is derived, every time the standard deviation calculated by the standard deviation calculation unit (35) is calculated, the bedtime exceeds a reference value including a standard deviation of a predetermined magnitude. It is not necessary to derive a period (for example, the upper 20% sleeping period in descending order of standard deviation), and the REM period in the notification period can be easily derived.

    Other configurations, operations, and effects are the same as those of the first embodiment.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

    The sleep state detection apparatus (1) of the first embodiment is configured to notify the wake-up when the late-stage (L) of the REM period is detected during the wake-up notification period. When the awakening is most comfortable in M), the bedtime may be notified to the sleeping person in the first semester (F) or intermediate period (M) of the REM period. In addition, as in the first embodiment, when the wake-up is notified in the intermediate period (M) or the late period (L) of the REM period, the wake-up is performed immediately after detecting the intermediate period (M) or the late period (L) of the REM period. In addition to notifying the REM period, it is estimated that a predetermined time (for example, 5 minutes or 15 minutes later) after the first period (F) of the REM period is an intermediate period (M) or a later period (L) of the REM period, It may be set so that the wake-up is notified at the later stage (L) of the REM period estimated as described above.

    The sleep state detection device (1) of the first embodiment is a device that performs wake-up notification during a predetermined period of the REM period, but does not perform wake-up notification and simply determines the predetermined period of the REM period. Also good.

    In the sleep state detection apparatus (1) of the first embodiment, the REM period deriving unit (41) sets the upper 20% sleeping periods in descending order of standard deviation as the REM period, but is not limited to the upper 20%. For example, the upper 10% sleeping period may be derived as the REM period, and when the standard value of the standard deviation of the heart rate in the REM period of the sleeping person can be estimated by daily measurement or the like, this reference value The bedtime period as described above may be derived as the REM period.

    In the present embodiment, the wake-up notification unit (39) notifies the sleeper of wake-up at 7:00 at the scheduled wake-up time at the latest, but the end of the notification period is a predetermined time after the scheduled wake-up time (for example, 7:15), or the end of the notification period may not be set, and the wake-up notification may be performed only when a predetermined period of the REM period is detected.

    In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

    As described above, the present invention is useful for a sleep state detection apparatus that detects a predetermined period of the REM period.

It is a whole block diagram of the sleep state detection apparatus of Embodiment 1. It is a schematic sectional drawing of the body motion sensor of Embodiment 1. 2 is a schematic block diagram of a circuit unit according to Embodiment 1. FIG. It is a flowchart which shows the sleep state detection operation | movement and wake-up alerting | reporting operation | movement of the sleep state detection apparatus of Embodiment 1. FIG. 2 is a diagram showing data derived in the first embodiment, (a) is a diagram showing an actual heart rate average value and a heart rate baseline, and (b) is an ultradian rhythm derived from the heart rate baseline. (C) is a figure which shows the standard deviation for every 10 minutes of a heart rate baseline. It is a flowchart which shows the sleep state detection operation | movement and wake-up alerting | reporting operation | movement of the sleep state detection apparatus of Embodiment 2.

Explanation of symbols

1 Sleep state detection device
2 Body motion sensor (measuring means)
34 Periodic component extraction unit (extraction means)
35 Standard deviation calculator (calculation means)
41 Heart rate baseline derivation unit (derivation method)
42 Rem predetermined period detector (detection means)
39 Wake-up notification section (notification means)

Claims (7)

A measuring means (2) for measuring a sleeper's heart rate;
Extraction means (34) for extracting a periodic component corresponding to the ultradian rhythm from the heart rate measured by the measurement means (2);
Calculating means (35) for calculating a standard deviation of the heart rate measured by the measuring means (2) every predetermined time;
Deriving means (41) for deriving a bedtime period equal to or greater than a reference value including a standard deviation of a predetermined magnitude among all the standard deviations calculated by the calculating means (35) as a REM period;
In the REM period derived by the deriving means (41), a detecting means (42) for detecting a predetermined period of the REM period based on a change in the periodic component extracted by the extracting means (34) is provided. A sleep state detection apparatus characterized by comprising: In claim 1,
The sleep state detection apparatus, wherein the detection means (42) detects the time when the change of the periodic component extracted by the extraction means (34) becomes a positive gradient as the first period (F) of the REM period. In claim 1,
The detection means (42) detects a time when the change of the periodic component extracted by the extraction means (34) becomes a positive extreme value as an intermediate period (M) of the REM period, Detection device. In claim 1,
The sleep state detection apparatus characterized in that the detection means (42) detects the time when the change of the periodic component extracted by the extraction means (34) becomes a negative gradient as the late stage (L) of the REM period. In claim 1,
Informing means for notifying the sleeping person when the detecting means (42) detects the predetermined period in the REM period in the informing period after the set time set before the predetermined time of the sleeping person's scheduled rising time. (39) The sleep state detection apparatus characterized by the above-mentioned. In claim 1,
The deriving means (41) is based on the standard value of the standard deviation from the start of bedtime to the set time in the notification period of the wakeup after the set time set before the predetermined time of the bedtime of the sleeper. Configured to derive the REM period in the broadcast period,
A sleep state detection apparatus comprising: a notification means (39) for notifying a sleeping person when the detection means (42) detects a predetermined period of the REM period during the notification period. In claim 5 or 6,
The notification means (39) is configured to notify a sleeping person at the scheduled wake-up time when the detection means (42) does not detect a predetermined period of the REM period by the scheduled wake-up time. A sleep state detection device.

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