JPH09276409A - Vigilance transfer device and vigilance transfer method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To comfortably awaken a living body by exactly detecting the sleep depth of the living body and applying the stimuli corresponding to the sleep depth to the living body. SOLUTION: The sleep depth of the living body is detected in accordance with the skin impedance detected by an electrode (thermal perspiration detecting electrode) 21-l for the skin impedance installed on the rear surface of a wristwatch, an electrode (reference electrode) 21-2 for the skin impedance and an electrode (mental perspiration detecting electrode) 21-3 for the skin impedance installed at a finger sack and the heart rate detected by a heart rate sensor 22 installed at the finger sack. The sound volume of an alarm is decided by fuzzy inference using the remaining time before the present vigil time and the sleep depth. The sound volume of the alarm is properly changed in such a manner, by which the sleep depth of the living body is transferred in order of non-REM sleep, REM sleep and vigil, by which the living body is comfortably awaken.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wakefulness transition device and a wakefulness transition method, and more particularly, to the sleep state of a living body using non-REM sleep, REM sleep, and fuzzy reasoning.
The present invention relates to a wakefulness state transition device and a wakefulness state transition method adapted to make a stepwise transition in the order of wakefulness.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a device for detecting a sleep depth of a living body and awakening the living body comfortably at a predetermined time according to the sleeping state.

For example, as disclosed in JP-A-63-019161 and JP-A-64-073286, the sleep depth of a living body is detected from the heartbeat, and the detected sleep depth is detected. Therefore, it has been proposed to change the time and volume of the alarm sound.

As a method of detecting the sleep depth with high accuracy, a method of measuring the skin temperature of the forehead is disclosed in Japanese Unexamined Patent Publication No. Hei 6-070889, in addition to the method based on the above heart rate.

Further, as a method for discriminating between the awake state and the sleep state, a method of measuring blood pressure is disclosed in JP-A-1-131.
This is described in detail in Japanese Patent Publication No. 648.

[0006]

However, for example, JP-A-63-019161 and JP-A-64-0 are disclosed.
The method of detecting the sleep depth of the living body from the heartbeat disclosed in Japanese Patent No. 73286 cannot detect the accurate sleep depth, and the awakening method is a method of giving a physical stimulus such as an alarm sound to the living body. Therefore, for example,
When a passenger is on a train, etc., other passengers may be annoyed, or if the living body does not awaken despite using such physical means, it is possible to wake up the living body without fail. Can not.

Further, for example, in the method for detecting the sleep depth of a living body with high accuracy according to Japanese Patent Laid-Open Nos. 6-07089 and 1-131648, a predetermined sensor for detecting skin temperature is installed on the forehead. Since it is necessary to periodically apply pressure to a predetermined part of the living body to measure the blood pressure, there is a feeling of strangeness and it is not possible to sleep comfortably.

As described above, the conventional method has a problem that the living body cannot be surely awakened without making the living body feel uncomfortable.

The present invention has been made in view of such a situation, and at a predetermined time without giving an uncomfortable feeling to a living body,
This is to ensure that the living body can be awakened.

[0010]

A wakefulness transition device according to claim 1 is configured so that, when non-REM sleep is detected by the detection means when the time approaches, the wakefulness transition device moves to the REM sleep state in the living body. It is characterized in that it is provided with a stimulating means for giving a larger stimulus so as to make a transition to a wakeful state when REM sleep is detected by giving a mild stimulus.

According to a fourth aspect of the present invention, in the wakefulness transition method, when non-REM sleep is detected when the time approaches, a slight stimulus is applied to the living body so as to shift to the REM sleep state, and the REM sleep is reduced. When detected, it is characterized by giving a larger stimulus so as to shift to an awake state.

In the wakefulness transition device according to the first aspect, the stimulating means, when the time approaches, when the non-REM sleep is detected, the living body is provided with a mild stimulus so as to transit to the REM sleep state. Give a greater stimulus to transition to wakefulness when REM sleep is detected.

In the wakefulness transition method according to claim 4, when non-REM sleep is detected when the time approaches, a slight stimulus is given to the living body so as to shift to the REM sleep state, and the REM sleep is performed. When sleep is detected, a greater stimulus is given to transition to wakefulness.

[0014]

1 is a block diagram showing the configuration of an embodiment of an awakening system to which the awakening state transition device of the present invention is applied.

Sleep depth recognition / wakeup devices 1-1 to 1-n
Is installed in the living body to be awakened in each of the rooms 3-1 to 3-n, and is adapted to give a predetermined stimulus for awakening the living body to the living body in accordance with the awakening time. Further, the sleep depth recognition / wakeup devices 1-1 to 1-n are also configured to output a warning signal when the living body does not awaken even when approaching the waking time. This warning signal is supplied to the warning display device 2 in a predetermined monitoring room 4 via a wire or wirelessly.

The warning display device 2 installed in the monitoring room 4 is
The warning signal is analyzed and a predetermined warning screen is displayed on the CRT 20 included therein.

FIG. 2 is a block diagram showing the configuration of an embodiment of the sleep depth recognition / wakeup device 1-1. Although illustration is omitted, the other sleep depth recognition / wakeup devices 1-2 to 1-n have the same configuration as the sleep depth recognition / wakeup device 1-1.

The skin impedance sensor 21 of the biological information measuring device 11 detects the impedance of skin electrical activity and outputs it to the skin impedance measuring device 23. The impedance of the skin electrical activity is converted by the skin impedance measuring device 23 into a predetermined numerical value representing the average level of the skin impedance appearance interval, and is output to the sleep depth recognition device 12. The sensor 21 may be a sensor that applies a constant AC current to detect skin impedance, or a sensor that applies a constant DC current to detect skin conductance or skin potential.

Further, the heartbeat sensor 22 of the biological information measuring device 11 is adapted to detect information relating to the heartbeat of the living body and output it to the heartbeat measuring device 24. The information about the heartbeat of the living body is converted by the heartbeat measuring device 24 into a predetermined numerical value indicating the variation of the heartbeat, and is output to the sleep depth recognition device 12.

The sleep depth recognizing device 12 judges the awake state and the sleep state from the numerical value of the skin impedance appearance interval,
The sleep depth is recognized based on the variation in the heart rate, and the result is supplied to the awakening method determination device 13.

[0021] The user has an awakening time equipped with a magnetic reader.
By a predetermined operation of the target ID input device 14, a desired awakening time and a predetermined identification number (ID) corresponding to the living body to be awakened are input.

As the awakening time / awakening time input to the target ID input device 14, a desired time may be directly input, or an event corresponding to the desired time, for example,
When the user is on a predetermined train, the destination station name (destination) may be input, or a predetermined designated ticket may be read by a magnetic reader.

As the identification number input to the awakening time / target ID input device 14, the identification number of the sleep depth recognition / wakeup device 1-1 may be input, or it corresponds to the living body to be awakened. In the case where the ID, for example, the user is on a predetermined train, the seat number may be directly input, or a predetermined designated ticket may be read by a magnetic reader.

These pieces of information are input to the awakening time / target ID determining device 17.

The awakening time / target ID determining device 17 causes the conversion DB 25 to search the arrival time at the station from the timetable, if necessary, and automatically sets this time as the awakening time, or the seat The conversion DB 25 is searched for the identification number of the sleep depth recognition / wakefulness device 1-1 corresponding to the number, and this identification number is automatically set as the target ID, and is supplied to the awakening method determination device 13.

The present time determination device 15 is provided with a predetermined clock mechanism and is adapted to supply the present time to the remaining time calculation device 16.

The remaining time calculating device 16 calculates the difference between the awakening time supplied from the awakening time / target ID determining device 17 and the current time supplied from the current time determining device 15 to obtain the awakening time. The remaining time is calculated and output to the awakening method determination device 13.

The awakening method determination device 13 includes the sleep depth of the living body supplied from the sleep depth recognition device 12, the remaining time until the awakening time supplied from the remaining time calculation device 16, and the awakening time / target ID determination device 17. Based on the supplied identification number of the living body to be awakened, the volume of the alarm is determined by using fuzzy inference, and whether or not the warning signal is output is determined. Further, according to this determination, an instruction to output an alarm sound of a predetermined volume is supplied to the alarm sound generator 18, and a warning signal is sent to the warning display device 2 installed in the monitoring room 4 via a wire or wirelessly. Is output.

The alarm sound generator 18 is adapted to output an alarm sound of a predetermined volume from a speaker 19 having a built-in speaker in accordance with an alarm sound output instruction.

The warning display device 2 is adapted to display a predetermined warning message regarding the corresponding living body on the CRT 20 in accordance with the warning signal.

FIG. 3 is a diagram showing an external configuration of the sleep depth recognition / wakeup device 1-1.

As shown in FIG. 3, the sleep depth recognition / wakeup device 1-1 basically has the same shape as a wristwatch. FIG. 3 is a sleep depth recognition / wakeup device 1-
1 is an external view of the watch 1 viewed from the back side, and the current time is displayed on the front side as in a normal wristwatch. In addition, a predetermined input unit including an awakening time / target ID input device 14 is installed on the front side of the sleep depth recognition / wakeup device 1-1. Although not shown, the other sleep depth recognition / wakefulness devices 1-2 to 1-n have the same configuration as the sleep depth recognition / wakefulness device 1-1 shown in FIG.

The skin impedance sensor 21 includes a main body 3
1. An electrode for skin impedance (heat and perspiration detection electrode) 21-1, a electrode for skin impedance (reference electrode) 21-2, which is installed on the back side of 1, and an electrode for skin impedance (a mental perspiration detection electrode) installed on the finger sack 32. ) 21
-3. Heart rate sensor 22 is a finger sack 3
It is installed in No. 3 and is composed of an integrated light emitting / receiving optical sensor. These finger cots 32 and 33 are designed to be attached to the index finger and the middle finger for use.

Next, regarding the processing operation of the awakening system,
This will be described with reference to the flowchart of FIG.

In step S1 of FIG. 4, the user performs an awakening time / identification number of the living body to be awakened by a predetermined operation of the target ID input device 14 (sleep depth recognition / awareness numbers of the awakening devices 1-1 to 1-n. ) And enter the awakening time. Also,
The user operates a predetermined input section (not shown) to set a warning display mode for outputting a warning signal as necessary,
Set the alarm mode to wake up the living body by the alarm sound.

At this time, the awakening time / target ID determination device 1
7 outputs the awakening time to the remaining time calculating device 16. Further, when the input is an event corresponding to the awakening time (for example, the input of the destination), the conversion DB 25 converts it into the corresponding awakening time (arrival time) and outputs it to the remaining time calculating device 16. . The awakening time / target ID determination device 17 also supplies the identification number to the awakening method determination device 13.

In subsequent step S2, the skin impedance of the living body detected by the skin impedance sensor 21 is converted into a numerical value indicating a predetermined impedance appearance interval by the skin impedance measuring device 23 and output to the sleep depth recognizing device 12. Further, the heartbeat of the living body detected by the heartbeat sensor 22 is converted into a numerical value indicating a predetermined heartbeat variation by the heartbeat measuring device 24, and the sleep depth recognition device 12
Is output to

In the subsequent step S3, the sleep depth recognizing device 12 determines the sleep depth of the living body by using the skin impedance appearance interval and the numerical value of the heart rate variability.

That is, first, the change component δZ of the skin impedance level, GSR (Galvanic Skin Reflex) appearance interval t, and three fuzzy numbers (S: low, M: medium, B: high) are used. The arousal level V represented by the following language model is calculated. if δZ is S and t is S then if is δZ is S and t is M then V is S. if δZ is S and t is B then V is M. if δZ is M and t is S then V is S. if δZ is M and t is M then V is M. if δZ is M and t is B then V is B. if δZ is B and t is S then V is S. if δZ is B and t is M then V is M. if δZ is B and t is B then V is B.

Next, the following language is obtained by simplified fuzzy inference using the heart rate variability Cc (the absolute value of the difference between the predetermined one minute heart rate and the next one minute heart rate) and the arousal level V. The sleep depth SL represented by the model is obtained. if V <10 then SL = 0 (wakefulness) if (10 ≦ V) and (Cc <6) then SL = 1 (REM sleep) if (10 ≦ V) and (6 ≦ Cc) then SL = 2 (non-REM sleep) )

In step S4, the remaining time calculating device 16 calculates the difference between the awakening time supplied from the awakening time / target ID determining device 17 and the current time supplied from the current time determining device 15, Calculate the time remaining until the awakening time. Then, the calculation result is output to the awakening method determination device 13.

Next, in step S5, the awakening method determination device 13 determines whether or not the remaining time is less than the predetermined reference time α. When it is determined that the remaining time is longer than the predetermined reference time α, the process branches to step S2 and the subsequent process is repeatedly executed.

In this way, while the remaining time is longer than the reference time α, the processing of steps S2 to S5 is repeatedly executed, and when the remaining time becomes shorter than the reference time α, the processing of step S6 is executed. To be done. The reference time α is the time at which the alarm sound starts to sound, and is set freely by the user.

In step S6, the awakening method determination device 13
Determines whether or not the living body is awake from the information on the sleep depth detected in step S3. When it is determined that the living body is awake, the process branches to step S2 and the subsequent processes are repeatedly executed. When it is determined that the living body is not awake, the process branches to the subsequent step S7.

In step S7, it is determined whether or not the sleep depth recognition / wakeup devices 1-1 to 1-n are operating in the warning display mode. If it is determined that the operation is not in the warning display mode, the process branches to step S10. However, if it is determined that the warning display mode is set, the awakening method determination device 13 uses the sleep depth and the remaining time in step S8. The fuzzy inference determines whether to output a warning signal.

The details of the processing in step S8 will be described with reference to FIGS.

FIG. 5 shows three fuzzy numbers S (low order), M.
It is a figure which shows the membership function of the remaining time Tr which used (medium) and B (high).

As shown in FIG. 5, the remaining time Tr is 30 at maximum.
It shall be counted from (= α) minutes. That is, according to the membership function of FIG. 5, the time from 30 minutes before the awakening time to the awakening time is classified into any of the fuzzy numbers S, M, or B.

FIG. 6 shows a fuzzy control law for obtaining a value Ws indicating whether or not to output a warning signal.

The sleep depth SL in FIG. 6 is obtained in step S3. A value of 0 indicates that the sleep depth of the living body is awake, 1 indicates REM sleep, and 2 indicates non-REM sleep. It means that each is. The remaining time Tr in this table is the value of any of the fuzzy numbers S, M, or B obtained from the graph of FIG.

In FIG. 6, a value Ws of 1 indicates that a warning signal is output, and a value of Ws 0 indicates that a warning signal is not output. The fuzzy control law of FIG. 6 can be expressed as a language model as follows. if Tr is S and SL is 0 then Ws is 0.if Tr is S and SL is 1 then Ws is 1. if Tr is S and SL is 2 then Ws is 1. if Tr is M and SL is 0 then Ws is 0. if Tr is M and SL is 1 then Ws is 0. if Tr is M and SL is 2 then Ws is 0. if Tr is B and SL is 0 then Ws is 0. if Tr is B and SL is 1 then Ws is 0. if Tr is B and SL is 2 then Ws is 0.

That is, the warning signal is output only when the remaining time Tr is S and the sleep depth SL is 1 (REM sleep) or 2 (non-REM sleep). Since the output value Ws of the above-mentioned simplified fuzzy inference is analog,
A final determination as to whether or not to output the warning signal is made by the following conditional expression. if Ws <0.5 then Output warning signal if 0.5 ≦ Ws then Do not output warning signal

In this way, whether or not to output the warning signal is determined based on the remaining time Tr and the sleep depth SL by using fuzzy inference.

Returning to the explanation of the flow chart of FIG. 4, in step S9, the wake-up method determination device 13 outputs a warning signal including the identification number of the sleep depth recognition / wake-up device 1 according to the determination, if necessary. The warning display device 2 analyzes this warning signal and displays a predetermined warning screen on the CRT 20.

FIG. 7 shows a display example of the warning screen displayed on the CRT 20 in this way. As shown in FIG. 7, on the warning screen, the numbers (315, 316, etc.) of the rooms 3-1 to 3-n corresponding to the identification numbers of the sleep depth recognition / wakeup devices 1-1 to 1-n, and the awakening state. The time remaining until the time is displayed in a histogram. Therefore, for example, a crew member such as a conductor in the case of a train, a nurse or an attendant in the case of a hospital, and a hotelman in the case of a hotel are displayed on the CRT 20 resident in a predetermined monitoring room 4, respectively. From the information provided, it is possible to recognize the room number of the awakening person and the remaining time until the awakening time, and it is possible to take necessary measures to awaken the sleeping person as necessary.

Returning to the explanation of the flow chart of FIG. 4, in step S10, the sleep depth recognition / wakefulness devices 1-1 to 1-
It is determined whether n is operating in the alarm mode. If it is determined that it is not operating in alarm mode,
Although the process branches to step S2, when it is determined that the alarm mode is operating, the awakening method determination device 13 determines the alarm volume by fuzzy inference using the sleep depth and the remaining time in step S11.

Details of the processing in step S11 will be described with reference to FIG.

FIG. 8 shows a fuzzy control law for obtaining the volume O of the alarm.

The sleep depth SL in FIG. 8 is obtained in step S3. The remaining time Tr in this table is shown in FIG.
It is the fuzzy number obtained from the graph.

In FIG. 8, when the volume O is the value S, the volume of the alarm is zero, that is, the alarm does not sound, and when the volume O is the value M, the volume of the alarm is small. Indicates that the volume of the alarm is high when the value is B. This fuzzy control law can be expressed as a language model as follows. if Tr is S and SL is 0 then O is S. if Tr is S and SL is 1 then O is B. if Tr is S and SL is 2 then O is B. if Tr is M and SL is 0 then O is S. if Tr is M and SL is 1 then O is B. if Tr is M and SL is 2 then O is M. if Tr is B and SL is 0 then O is S. if Tr is B and SL is 1 then O is M. if Tr is B and SL is 2 then O is S.

In this way, the volume O of the alarm is determined by the remaining time Tr and the sleep depth SL using fuzzy reasoning.

In the following step S12, the awakening method determination device 13 instructs the alarm sound generation device 18 to generate an alarm sound at the determined predetermined volume. According to this instruction, the alarm sound generation device 18 causes the speaker 19 to output the alarm sound at a predetermined volume.

After that, the process again branches to step S2, and the subsequent processes are executed.

In this way, the volume of the alarm is set to an appropriate volume or the warning signal is output based on the remaining time and the sleep depth of the living body by the fuzzy inference.
By setting the volume of the alarm to an appropriate volume, it is possible to shift a predetermined living body from the non-REM sleep state to the REM sleep state, and then to the awake state stepwise. In this embodiment, the volume of the alarm is changed according to the sleep depth of the living body, but the interval or pitch of the alarm sound may be changed.

As described above, the sleep depth of the living body is changed step by step in the order of non-REM sleep, REM sleep, and awakening (for example, when non-REM sleep, a small bell sound is used to change to REM sleep. By awakening at a loud volume when, the living body can wake up comfortably.

As a sensor for detecting the sleep depth, the back side of the wristwatch-shaped main body 31 and the finger cots 32, 3 are used.
Since the skin impedance sensor 21 and the heartbeat sensor 22 installed in No. 3 are used, it is possible to realize a system that does not give an uncomfortable feeling to a living body.

Further, since the skin impedance sensor 21 determines whether the living body is in the sleeping state or the awake state, and the heartbeat sensor 22 detects the sleep depth of the living body, an accurate detection result can be obtained. .

Furthermore, if the living body is not awakened even if a predetermined stimulus is given, an alarm signal can be output to notify a predetermined monitoring person of the situation.

Although the living body is awakened by the alarm sound in the above embodiment, the living body can be awakened by a predetermined vibration, music, lighting or the like instead of the stimulus by the alarm sound. . Further, the value Ws indicating whether or not the warning signal is output shown in FIG. 6 and the value O indicating the sound volume of the alarm shown in FIG. 8 can be freely set by the user.

[0070]

As described above, according to the wakefulness transition device according to claim 1 and the wakefulness transition method according to claim 4, a slight stimulus is given when non-REM sleep is detected,
When the awakening time is reached, a larger stimulus is given, so that the sleep state of the living body can be gradually changed and the living body can be awakened comfortably.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an awakening system to which an awakening state transition device of the present invention is applied.

FIG. 2 is a block diagram showing a configuration of an embodiment of a sleep depth recognition / wakefulness device 1-1.

FIG. 3 is a diagram showing an appearance of an embodiment of a sleep depth recognition / wakeup device 1-1.

FIG. 4 is a flowchart illustrating a processing operation of the awakening system.

FIG. 5 is a graph showing a membership function for obtaining a remaining time Tr.

FIG. 6 is a table showing a fuzzy control law for obtaining a value Ws indicating whether or not a warning signal is generated.

FIG. 7 is a diagram showing a display example of a warning screen displayed on the CRT 20.

FIG. 8 is a table showing a fuzzy control law for obtaining a value O representing the volume of an alarm.

[Explanation of symbols]

 1-1 to 1-n Sleep Depth Recognition / Awakening Device 2 Warning Display Device 11 Biometric Information Measuring Device 12 Sleep Depth Recognition Device 13 Awakening Method Determination Device 14 Awakening Time / Target ID Input Device 15 Current Time Determination Device 16 Remaining Time Calculation Device 17 Awakening time / target ID determining device 18 Alarm sound generating device 19 Speaker 20 CRT 21 Skin impedance sensor 21-1 to 21-3 Skin impedance electrode 22 Heartbeat sensor 23 Skin impedance measuring device 24 Heartbeat measuring device 25 Conversion DB 31 Main body 32 , 33 finger sack

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yutaka Haga, No. 10 Hanazono Dodo-cho, Ukyo-ku, Kyoto City, Kyoto Prefecture Omron Co., Ltd. (72) Inventor Tsutomu Ishida No. 10 Hanazono-Todo-cho, Ukyo-ku, Kyoto City, Kyoto Omron Within the corporation

Claims (5)

[Claims] 1. A wakefulness transition device that transitions a living body from a sleeping state to a wakeful state at a predetermined wakeful time, an acquisition unit that acquires the wakefulness time, a detection unit that detects the sleep depth of the living body, When the time approaches, when non-REM sleep is detected by the detection means, the living body is given a slight stimulus so as to shift to the REM sleep state, and when REM sleep is detected, shifts to the awake state. As described above, the wakefulness transition device further comprising a stimulating means for giving a greater stimulus. 2. The awakening according to claim 1, wherein when the detecting means detects an awake state before the awakening time, the stimulating means stops the supply of the stimulus to the living body. State transition device. 3. The wakefulness transition device according to claim 1, wherein the acquisition unit calculates the awakening time from information on a destination to which the living body moves. 4. A wakefulness transition method for shifting a living body from a sleeping state to a wakeful state at a predetermined wakeful time, wherein the wakefulness time is acquired, the sleep depth of the living body is detected, and when the time approaches. When non-REM sleep is detected, the living body is given a slight stimulus so as to shift to a REM sleep state, and when REM sleep is detected, a larger stimulus is given so as to shift to a wakeful state. Characteristic awakening state transition method. 5. The method for transitioning to an awake state according to claim 4, wherein when the awake state is detected before the awake time, the supply of the stimulus to the living body is stopped.