JP5526308B2 - Sleep quality evaluation device - Google Patents

Description

  The present invention relates to a sleep quality evaluation device that detects an infant's sleep quality and evaluates the sleep quality of the infant by determining the sleep stage of the infant from a biological signal such as heartbeat or breath detected from the vibration.

  It is known that there is a close relationship between infants' healthy growth and sleep, and it is important to know the infant's sleep state and to understand the infant's health and brain development. It has become. The term “infant” as used herein refers to an age including an infant and an infant, and refers to an age at which the appearance of REM sleep and non-REM sleep in which transition of the sleep stage appears in an adult is not remarkable. Infants also include newborns that have just been born.

  When there is an abnormality in the infant's growth process, disturbances often appear in the sleep state, and when there is an abnormality in the infant's growth, it is necessary to detect and treat the abnormality as early as possible .

  Infants' sleep stages are classified into dynamic sleep, static sleep, and indeterminate sleep. Because the brains of newborns and infants are underdeveloped, they do not exhibit the same sleep stages as adults. Dynamic sleep is sleep that corresponds to the prototype of adult REM sleep, and it has a rich expression and body movement that is incomparable to adults. More than half. Static sleep is sleep that corresponds to the prototype of adult non-REM sleep, and when it is in static sleep, growth hormone is secreted from the pituitary gland. Growth hormone is essential for the growth of newborns and infants. Indefinite sleep is sleep that does not fall under dynamic sleep and static sleep, and it has been found that body movements are further increased than dynamic sleep.

  As a method of knowing the transition of the sleep stage of an adult, a method of determining a sleep stage from a biological signal such as a polygraph method or a heartbeat signal that is analyzed by measuring an electroencephalogram is known. However, in order to measure electroencephalogram by the polygraph method, it is necessary to adhere an electrode to the head, and it is difficult to apply to infants because it is a physical and mental burden even for adults. It is. On the other hand, in the method of determining the sleep stage from a biological signal such as a heartbeat signal, the actual situation is that a method for determining the sleep stage of an infant is not established.

  As a method of confirming the healthy growth of infants, it is currently judged from sleep records handwritten by family members such as mothers, but this is a fact, and there is a problem that it is not accurate and the burden of recording is large is there.

  As mentioned above, measuring and recording the transition of the infant's sleep stage is important for knowing the infant's growth state, but there is no suitable device for measuring the transition of the infant's sleep stage. Although family members such as mothers have recorded sleep records by hand, there are problems of lack of accuracy and a large burden of recording.

  In view of the above problems, the present invention can measure and record the transition of the sleep stage over a long period of time without disturbing the infant's sleep, and can easily perform the evaluation measurement of the sleep quality of the newborn and the infant. It is possible to provide a sleep state measuring apparatus that can be used by an observer on a daily basis. In particular, the present invention quantitatively measures the ratio of each sleep stage of dynamic sleep, static sleep, and indeterminate sleep of an infant. It aims at providing the apparatus which can evaluate the quality of sleep by this.

In order to achieve the above object, the sleep quality evaluation apparatus according to the first solving means of the present invention detects a biological vibration from a biological vibration detecting means for detecting a biological vibration of an infant and a biological signal from the output signal of the biological vibration detecting means. The biological signal detection means, and the biological signal obtained by the biological signal detection means , the peak value is controlled to be constant by performing gain control, and the intensity of the biological signal is calculated using the gain value at that time Obtained by the biological signal intensity dispersion calculating means, the biological signal intensity dispersion value calculating means for obtaining a dispersion value within a predetermined time of the intensity of the biological signal calculated by the biological signal intensity calculation means, and the biological signal intensity dispersion value calculating means. sleep stages kinematic sleep of the infant from the obtained dispersion value of the biological signal strength, static sleep, the sleep stage determination means for determining whether they fall in a undefined sleep, the obtained in the sleep stage determination means It is compared with the standard values corresponding to the age of the ratio between the infant appearing dynamic sleep-static sleep-indeterminate sleep from a change of infant sleep stage and a sleep evaluation means for determining the quality of sleep of the infant, The sleep stage determination means determines that the sleep state is a static sleep state if the dispersion value of the biological signal intensity obtained by the biological signal intensity dispersion value calculation means is smaller than a first threshold, and the dispersion value is the first value. If it is larger than the threshold value and smaller than the second threshold value, it is determined to be dynamic sleep, and if the variance value is larger than the second threshold value, it is determined to be indefinite sleep .

  According to said 1st solution means, the biological signal of the infant is detected from the biological vibration detected by the biological vibration detection means, the infant's sleep stage is determined from the variance value of the intensity of the signal, and the transition of the sleep stage Record. Unlike the measurement of EEG and myoelectric potential, it is possible to detect biological vibration without placing physical and mental burden on the infant, and from this detection signal, the transition of the infant's sleep stage and the quality of sleep can be detected. Enables evaluation.

  A second solving means of the present invention is the sleep quality evaluation apparatus according to the first solving means, wherein the biological signal is a heartbeat signal, and the heartbeat signal is closely related to a sleep state. Is used as an indicator signal for the evaluation of sleep quality to ensure the evaluation of sleep quality.

  A third solving means of the present invention is the sleep quality evaluation apparatus according to the first solving means, wherein the biological signal is a respiratory signal, and the heartbeat signal is closely related to the sleep state. Is used as an indicator signal for the evaluation of sleep quality to ensure the evaluation of sleep quality.

  A fourth solving means of the present invention is the sleep quality evaluation apparatus according to the first solving means, wherein the sleep stage determining means is based on the variance value of the biological signal intensity obtained by the biological signal intensity variance value calculating means. It is characterized by determining static sleep, dynamic sleep, and indeterminate sleep, which are the sleep stages of infants, and it is possible to evaluate the quality of sleep of infants by detecting the transition of sleep stages of infants.

  A fifth solving means of the present invention is the sleep quality evaluating apparatus of the first solving means, wherein the biological vibration detecting means is composed of a micro-differential pressure sensor and a biological vibration detecting unit. It is characterized in that biological vibration is detected by detecting a change in the pressure of the air accommodated in the inside using a micro-differential pressure sensor, and there is little burden on the infant's body in detecting the biological vibration of the infant.

  A sixth solving means of the present invention is the sleep quality evaluation apparatus according to the fifth solving means, wherein the biological vibration detecting unit of the biological vibration detecting means is a hollow tube having elasticity. The biological vibration of the infant, that is, the vibration of breathing, heartbeat or body movement is transmitted to the air in the hollow tube, and the vibration is detected by the fine differential pressure sensor.

  A seventh solving means of the present invention is the sleep quality evaluation apparatus according to the fifth solving means, wherein the biological vibration detecting unit of the biological vibration detecting means is a mat filled with air inside. In addition, biological vibrations of infants, that is, vibrations of breathing, heartbeats or body movements are transmitted to the air filled in the mat, and the vibrations are detected by a fine differential pressure sensor.

  An eighth solving means of the present invention is the sleep quality evaluation apparatus according to the sixth or seventh solving means, wherein the biological vibration detection unit is formed so as to be accommodated in a seat, and the seat is formed by an infant's body. It is characterized in that it is mounted and used, and can accurately detect biological vibrations of infants.

  According to a ninth aspect of the present invention, there is provided the sleep quality evaluation apparatus according to the fifth aspect, wherein the biological vibration detection unit includes a wireless communication unit, and can be entangled with an infant's body during sleep. Since there is no sexual communication wiring, measurement during sleep can be performed safely.

  The sleep quality evaluation device of the present invention extracts a biological signal of an infant, i.e., a respiratory signal or a heartbeat signal, from a biological vibration detected by a biological vibration detecting means, and detects a transition of a sleep stage from a dispersion value of the signal intensity. This is a sleep quality evaluation device for measuring the quality of sleep, and the configuration of the device is simple, and the quality of sleep of an infant can be easily evaluated.

  In addition, because it uses biological vibration detection means that does not place an excessive burden on the infant's body, it can be used on an everyday basis for infants, and the sleep quality of the infant is evaluated from the measured transition data of the sleep stage. This makes it possible to manage the growth and health of the infant.

  The sleep quality evaluation apparatus of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by a present Example.

  FIG. 1 is an explanatory view for explaining a sleep quality evaluation apparatus according to the present invention, and FIG. 2 is an explanatory view showing a biological vibration detecting means different from the biological vibration detecting means shown in FIG. FIG. 3 is a flowchart showing a process of evaluating sleep quality from a heartbeat signal detected from a biological vibration signal, and FIG. 4 is a flowchart showing a process of evaluating sleep quality from a respiratory signal detected from the biological vibration signal. FIG.

  FIG. 1 is a block diagram showing the configuration of the sleep quality evaluation apparatus of the present invention, and FIG. 1B is a partial cross-sectional view seen from the direction of the arrow. The biological vibration detection means 1 shown in FIG. 1 is a detection means for detecting minute biological vibrations of an infant, and the biological vibration detection means 1 enables the signal amplification and shaping means 2 to process a signal in the subsequent processing steps. The detected signal is amplified, unnecessary signals are removed by a band-pass filter or the like, and sent to the biological signal detection means 3.

  The biological vibration detection means 1 includes a pressure sensor 1a and a pressure detection tube 1b that is a biological vibration detection unit, and constitutes biological vibration detection means that does not place an excessive burden on the infant who is the subject. The pressure sensor 1a is a sensor that detects minute fluctuations in pressure. In this embodiment, a low-frequency condenser microphone type is used. However, the pressure sensor 1a is not limited to this, and has an appropriate resolution and dynamic range. If it is.

  The low-frequency condenser microphone used in this example is replaced with a general acoustic microphone that does not consider the low-frequency area. This is a significant improvement and is suitable for detecting minute pressure fluctuations in the pressure detection tube 1b. In addition, it is excellent for measuring minute differential pressure, has a resolution of 0.2 Pa and a dynamic range of about 50 Pa, and is several times the performance of a fine differential pressure sensor using a ceramic that is normally used. It is suitable for detecting a minute pressure applied to the pressure detection tube 1b through the body surface through the body vibration. The frequency characteristic shows an almost flat output value between 0.7 Hz and 20 Hz, and is suitable for detecting minute biological vibration such as a respiratory signal or a heartbeat signal.

  As the pressure detection tube 1b, a tube having an appropriate elasticity so that the internal pressure fluctuates corresponding to the pressure fluctuation range of the biological vibration is used. Further, in order to transmit the pressure change to the fine differential pressure sensor 1a at an appropriate response speed, it is necessary to appropriately select the volume of the hollow portion of the pressure detection tube 1b. When the pressure detection tube 1b cannot satisfy the appropriate elasticity and the volume of the hollow portion at the same time, the hollow portion of the pressure detection tube 1b is loaded with a core wire having an appropriate thickness over the entire length of the tube, and the volume of the hollow portion is appropriately set. Can take.

  The pressure detection tube 1b is disposed on a hard sheet 12 laid on a bed 11, and an elastic cushion sheet 13 is laid thereon, on which an infant is laid. It is desirable that the pressure detection tube 1b has a structure that stabilizes the position of the pressure detection tube 1b by incorporating the pressure detection tube 1b into the cushion sheet 13 or the like. Note that the bedding such as a futon is not shown here.

  In this embodiment, as shown in FIG. 1, two sets of biological vibration detecting means are provided, one of which detects biological vibrations in the infant's chest region and the other detects the infant's buttocks region. The biological vibration is stably detected regardless of the sleeping posture of the infant. It is also possible to adopt a configuration in which only one set of the pressure detection tubes 1a is arranged by appropriately selecting the arrangement of the tubes.

  The biological vibration detected by the biological vibration detecting means 1 is a signal in which various vibrations emitted from the infant's body are mixed, and includes signals such as a respiration signal, a heartbeat signal, and a turnover. The biological vibration detected by the biological vibration detection means 1 is amplified by the signal amplification shaping means 2, and an appropriate signal shaping process is performed by further removing signals having an apparently abnormal level.

  The output signal of the signal amplifying / shaping means 2 includes various signals generated by the living body such as breathing, heartbeat, and body movement. In the living body signal detecting means 3, the transition of the sleep stage is detected using a bandpass filter or the like. A biological signal used for measurement is extracted. The present embodiment shows an embodiment in which a respiratory signal or a heartbeat signal is used as a biological signal used for measuring the transition of the sleep stage.

  The automatic gain control means 4 is a so-called AGC circuit that automatically performs gain control so that the output of the biological signal detection means 3 falls within a predetermined signal level range. The gain value (coefficient) at this time is used as the signal intensity. It outputs to the calculating means 5. For gain control, for example, the gain is set so that the amplitude of the output signal decreases when the peak value of the signal exceeds the upper threshold, and the gain is increased when the peak value falls below the lower threshold. doing.

  The signal strength calculation means 5 calculates the signal strength from the gain control coefficient applied to the biological signal in the automatic gain control means 4. It is preferable to set a function indicating the signal strength so that the gain value obtained from the AGC circuit is set to be small when the signal size is large and to be large when the signal size is small.

  The signal intensity variance calculation means 6 calculates the variance value (standard deviation) of the data of the biological signal within the predetermined time detected by the signal intensity calculation means 5. By obtaining the variance value of the biological signal at each time, time series data of the variance value is obtained. Here, the variance value indicates a so-called statistical variance, and a standard deviation may be used instead of the variance.

  The sleep stage determination means 7 determines the sleep stage of the infant from the value of the variance value of the biological signal intensity obtained by the signal intensity variance calculation means 6. A threshold value corresponding to the sleep stage is set in advance, and the value obtained by the signal intensity dispersion calculating means 6 is compared with the threshold value to determine whether it belongs to dynamic sleep, static sleep, or indefinite sleep.

  The sleep quality evaluation means 8 compares the ratio of appearance of dynamic sleep, static sleep, and indeterminate sleep with the standard value according to the age of the infant based on the transition of the sleep stage obtained by the sleep stage determination means 7. Judge the quality.

  The result of sleep quality evaluation obtained by the sleep quality evaluation means 8 is output to the data storage / output means 9 so that it can be displayed on a monitor device (not shown) or printed on a printing device.

  In the above-described embodiment, an example in which a hollow tube is used as the biological vibration detection means has been described. However, the air mat shown in FIG. 2 can also be used as the detection means. Here, the biological vibration detecting means 10 is configured such that an air tube 10b is connected to one end of an air mat 10a in which air is enclosed, and is connected to a slight differential pressure sensor 10c. As the fine differential pressure sensor 10c, the same sensor as that described in the case of the biological vibration detection means using the hollow tube shown in FIG. 1, that is, the fine differential pressure sensor 1a can be used.

  The biological vibration detecting means shown in FIGS. 1 and 2 can be applied in the case of a crib or the like in which only infants are laid down, but when an adult such as a mother is lying together, as a result of detecting biological vibration that is not a measurement target, The biological vibrations of infants cannot be detected correctly.

  In such a case, the living body vibration detection unit is formed so as to be housed in the seat, and the seat is wound around the body of the infant to reduce the influence of the living body vibration of an adult lying together. Biological vibration can be detected. In that case, it is necessary that the seat to be mounted is appropriately small and lightweight so as not to disturb the daily life and sleep of the infant.

  Next, a procedure for evaluating the sleep quality of infants will be described with reference to FIG. 1 and FIG. 3 or FIG. A respiratory signal or a heartbeat signal can be used as an index signal for evaluating the quality of sleep. The flow diagram of FIG. 3 shows the process of evaluating the quality of sleep using the heartbeat signal detected from the biological vibration signal as an index signal, and the flow diagram of FIG. 4 shows the sleep quality from the respiratory signal detected from the biological vibration signal. The process to evaluate is shown.

  First, an embodiment for evaluating the quality of sleep using a heartbeat signal as an index signal will be described with reference to FIGS. The biological signal detected by the biological vibration detection unit of the biological vibration detecting means 1 is a complex vibration signal including body movement signals such as a respiratory signal, a heartbeat signal, and a turnover. In addition, the respiratory signal and the heartbeat signal are fine. Since it is a signal, the signal amplification and shaping means 2 amplifies and shapes the signal, and then the biological signal detection means 3 removes unnecessary signals other than biological signals such as heartbeat signals and respiratory signals by a bandpass filter or the like. A biological signal is detected. In order to evaluate the quality of sleep using the heartbeat signal as an index signal, the step of capturing a respiratory signal in FIG. 3 performs signal processing on the heartbeat signal among the biological signals.

  The peak value is controlled by controlling the gain of the signal with the automatic gain control means 4 for the heartbeat signal detected by the biological signal detection means 3. By using the automatic gain control means (AGC) 4, the abnormal value of the heart rate intensity signal is eliminated, thereby improving the data processing reliability.

  In the signal strength calculation means 5, the signal strength calculation means 5 calculates the signal strength using the gain of the heartbeat signal applied by the automatic gain control means 4. The automatic gain control means 4 performs gain adjustment to control the amplitude of the biological signal to a constant value, and the signal strength calculation means 5 calculates the reciprocal of this gain value as the biological signal strength. The heart rate intensity data is sampled every second to obtain time series data of the heart rate intensity.

  The signal intensity variance calculation means 6 acquires data for 60 seconds from the reference time among the time-series data of the heart rate obtained by the signal intensity calculation means 5, and calculates the variance value of the data. By obtaining the signal intensity variance value, the data is averaged, and data that is not related to the sleeping state, such as sleeping, can be obtained. When the signal intensity is used as it is, it is difficult to stably measure the transition of the sleep stage because it is affected by the sleeping state such as sleeping.

  In the sleep stage determination unit of the sleep quality evaluation means 8, a threshold value corresponding to the sleep stage is set in advance, and the value obtained by the signal intensity dispersion calculation means 6 is compared with the threshold value, thereby making the dynamic sleep, It is determined whether it belongs to indefinite sleep. FIG. 5 shows the transition of the dispersion value of the heart rate intensity signal while the infant is sleeping.

  The sleep stage for adults is divided into four stages, REM sleep and REM sleep, but because the brain is underdeveloped in infants, it is called as static sleep, dynamic sleep, and indefinite sleep unlike adults. It is classified. Dynamic sleep is sleep that is the prototype of adult REM sleep (the brain works by sleeping the body), and the eyeball moves frequently as in REM sleep of adults. In addition, the expression is very rich, and the movement of the body is too large to compare with adults. On the other hand, static sleep is sleep that is the prototype of non-REM sleep (brain sleep). Indefinite sleep is a sleep state that does not apply to either dynamic sleep or static sleep, and transitions to either dynamic sleep or static sleep over time.

  In FIG. 5, A <b> 1 is a threshold for determining static sleep, and if the variance value of the heartbeat intensity signal is smaller than A <b> 1, it is determined that the patient is in a sleep state. If the value of the variance value of the heart rate intensity signal is larger than A1 and smaller than A2, it is determined that the sleep is dynamic sleep. If the value of the variance value of the heart rate intensity signal is greater than A2, it is determined that the sleep is indefinite. In this way, the sleep stage determination unit of the sleep quality evaluation means 8 determines the sleep stage of the infant.

  The quality of sleep is evaluated in the sleep quality evaluation unit of the sleep quality evaluation means 8 by obtaining the ratio of the sleep of the sleep stage determined as described above, dynamic sleep and indeterminate sleep to the whole sleep. Although it depends on age, it is common for infants to occupy half or more of dynamic sleep in their overall sleep, and to evaluate infants' sleep quality by comparing with standard values according to age. Can do.

  FIG. 4 is a flowchart for evaluating the quality of sleep using a respiratory signal as an index signal. Here, the respiratory signal is detected by the biological signal detection means 3. In order to evaluate the quality of sleep using the respiratory signal as an index signal, the step of capturing the respiratory signal in FIG. 4 performs signal processing on the respiratory signal among the biological signals.

  The respiration signal detected by the biological signal detection means 3 is controlled in peak value by controlling the gain of the respiration signal by the automatic gain control means 4, and the signal intensity calculation means 5 uses the gain of this peak value to control the signal. Calculate the intensity. The automatic gain control means 4 performs gain adjustment to control the amplitude of the biological signal to a constant value, and the signal strength calculation means 5 calculates the reciprocal of this gain value as the biological signal strength. Respiratory signal intensity data is sampled every second to obtain time-series data of heartbeat signal intensity.

  The signal intensity variance calculating means 6 acquires data for 60 seconds from the reference time point in the time series data of the respiratory intensity obtained by the signal intensity calculating means 5, and calculates a variance value of the data. By obtaining the signal intensity variance value, the data is averaged, and data that is not related to the sleeping state, such as sleeping, can be obtained. When the signal intensity is used as it is, it is affected by the sleeping state such as sleeping, and so the quality of sleep cannot be evaluated stably.

  It is known that the respiratory signal intensity has a close relationship with the sleep stage similarly to the heartbeat signal intensity, and if the sleep stage is deep sleep, the variation in the respiratory signal intensity is small. On the other hand, the variation in the respiratory signal intensity increases as the state becomes awake. In the sleep stage determination unit of the sleep quality evaluation means 8, the sleep stage is determined in the same manner as in the case where the heartbeat signal is used as an index, and the sleep quality is evaluated from the result.

  In the sleep quality evaluation apparatus of this embodiment, as a method for detecting biological vibration, a method for extracting a biological signal from biological vibration obtained by biological vibration detection means placed under the infant's body has been shown. The above-described biological vibration detecting means constituting the present embodiment does not require an attachment that restrains the infant's body and a signal cord connected to these attachments, and does not disturb the infant's sleep.

  In the case of a configuration in which a biological vibration detection unit is wound around an infant's body, the biological vibration detection unit is equipped with a wireless communication means, so there is no need for a communication cable that may pose a danger to the infant and safe sleep quality. Can be evaluated.

  The apparatus for detecting biological vibrations necessary for evaluating the quality of sleep of infants is not limited to the configuration described in this embodiment, and biological signals such as respiratory signals and heartbeat signals are continued by detecting biological vibrations. Any detection means can be used. For example, the biological vibration detecting means of the present invention is a means for detecting a respiratory signal or a heartbeat signal from a biological vibration such as a respirometer or a pulse wave meter of the type worn on the body, and can record data continuously. Can be used as

  The sleep quality evaluation apparatus according to the present invention evaluates the quality of sleep of an infant by obtaining the biological signal intensity of the infant and using the intensity variation (variance) as an index value used to evaluate the sleep quality of the infant. The biological vibration detecting means for detecting biological vibration is configured to detect a biological signal without physically restricting the infant physically. Does not impose a heavy burden.

  Since the sleep quality evaluation device of the present invention can always grasp the health and growth of infants by evaluating the sleep quality of infants, it is possible to manage the health and growth of infants. Therefore, there is a great contribution to the prevention of infant developmental abnormalities and sudden death.

  It is a block diagram which shows the process of evaluating the structure and sleep quality of the sleep quality evaluation apparatus of this invention.   It is a top view which shows another biological vibration detection means.   It is a flowchart which shows the procedure which evaluates the quality of sleep using a heartbeat signal.   It is a flowchart which shows the procedure which evaluates the quality of sleep using a respiration signal.   It is a graph which shows the transition of the dispersion value of a heart rate signal strength, and the threshold value of a sleep stage.

DESCRIPTION OF SYMBOLS 1 Biological vibration detection means 2 Signal amplification shaping means 3 Biological signal detection means 4 Automatic gain control means 5 Signal intensity calculation means 6 Signal intensity dispersion calculation means 7 Sleep stage determination means 8 Sleep quality evaluation means 9 Data storage / output means 10 Biological Vibration detection means 11 Bed 12 Hard sheet 13 Cushion sheet

Claims (8)

Biological vibration detection means for detecting biological vibrations of infants;
Biological signal detection means for detecting a biological signal from the output signal of the biological vibration detection means;
A biological signal intensity calculating means for controlling the peak value to be constant by performing gain control on the biological signal obtained by the biological signal detecting means, and calculating the intensity of the biological signal using the gain value at that time; ,
A biological signal intensity dispersion value calculating means for obtaining a dispersion value within a predetermined time of the intensity of the biological signal calculated by the biological signal intensity calculating means;
The sleep stage of the infant from the dispersion values of the biological signal intensity obtained by the biosignal intensity variance value calculating means kinematic sleep, static sleep, the sleep stage determination means for determining whether they fall in a undefined sleep,
Sleep quality of the infant by comparing the standard value according to the age of the ratio between the infant appearing dynamic sleep-static sleep-indeterminate sleep from changes in sleep stage of the infant obtained by the sleep stage determination means and a sleep evaluation means for determining,
The sleep stage determination means determines that the sleep state is a static sleep state if the dispersion value of the biological signal intensity obtained by the biological signal intensity dispersion value calculation means is smaller than a first threshold, and the dispersion value is the first value. A sleep quality evaluation device characterized in that it is determined to be dynamic sleep if it is greater than a threshold and smaller than a second threshold, and that it is indefinite sleep if the variance value is greater than the second threshold. .   The sleep quality evaluation apparatus according to claim 1, wherein the biological signal is a heartbeat signal.   The sleep quality evaluation apparatus according to claim 1, wherein the biological signal is a respiratory signal.   The bio-vibration detecting means includes a micro-differential pressure sensor and a bio-vibration detecting unit, and detects bio-vibration by detecting a change in pressure of air stored in the bio-vibration detecting unit with the micro differential pressure sensor The sleep quality evaluation apparatus according to claim 1, wherein: The sleep quality evaluation apparatus according to claim 4 , wherein the biological vibration detection unit of the biological vibration detection means is a hollow tube having elasticity. The sleep quality evaluation apparatus according to claim 4 , wherein the biological vibration detection unit of the biological vibration detection means is a mat filled with air. The sleep quality evaluation apparatus according to claim 5 or 6 , wherein the biological vibration detection unit is formed so as to be accommodated in a seat, and the seat is used by being attached to an infant's body. The sleep quality evaluation apparatus according to claim 7 , wherein the biological vibration detection unit includes a wireless communication unit.