Sleep posture alerting apparatus and method
A sleep posture alerting method, wherein the sleep posture of a person is detected. The person is automatically alerted by a stimulus generated by an alerting device when the sleep posture is out of a predetermined body posture range. A stimulus variation is effected by the alerting device.
1. A sleep posture alerting apparatus for a person, comprising
an electronic control unit;
a body posture detecting sensor operatively connected to the electronic control unit and configured to detect a posture of a body of the person and generate a plurality of posture signals based on the posture;
a memory operatively connected to the electronic control unit;
a timer operatively connected to the electronic control unit; and
an alarming device operatively connected to the electronic control unit and configured to generate a plurality of alarm stimuli;
wherein the electronic control unit is configured to
receive a first posture signal from the body posture detecting sensor,
determine whether the body exited a predefined posture range based on the first posture signal,
generate an alarm signal if the body exited the predefined posture range,
send the alarm signal to the alarming device causing the alarming device to generate a first alarm stimulus to alert the person,
start the timer based on the alarm signal,
receive a second posture signal from the body posture detecting sensor based on a change of the posture of the body of the person,
determine a current reaction time between the start of the timer and receiving the second posture signal,
store the current reaction time in the memory,
determine an average reaction time based on at least one previously determined and stored reaction time,
determine whether the difference between the current reaction time and the average reaction time is outside a predefined margin,
generate a change signal if the difference between current reaction time and the average reaction time is outside the predefined margin, and
send a change signal to the alarming device causing the alarming device to generate a second alarm stimulus to alert the person, wherein the second alarm stimulus is different than the first alarm stimulus.
2. The sleep posture alerting apparatus according to claim 1 , wherein a type of the first alarm stimulus and the second alarm stimulus comprise at least two of the following: vibrotactile, tactile, electromagnetic, auditive, bone conduction, or a combination thereof.
3. The sleep posture alerting apparatus according to claim 1 , wherein each of the plurality of alarm stimuli has a characteristic comprising at least one selected from the group consisting of an amplitude, a strength, a length, a frequency, an interstimulus interval, a melody, a message, and a location.
4. The sleep posture alerting apparatus according to claim 3 , wherein at least one of the amplitude and the strength of the second alarm stimulus is different from at least one of the amplitude and the strength of first alarm stimulus.
5. The sleep posture alerting apparatus according to claim 3 , wherein the length of the second alarm stimulus is different from the length of the first alarm stimulus.
6. The sleep posture alerting apparatus according to claim 3 , wherein the frequency of the second alarm stimulus is different from the frequency of the first alarm stimulus.
7. The sleep posture alerting apparatus according to claim 3 , wherein the interstimulus interval of the second alarm stimulus is different from the interstimulus interval of the first alarm stimulus.
8. The sleep posture alerting apparatus according to claim 3 , wherein at least one of the melody and the message of the second alarm stimulus is different from at least one of the melody and the message of the first alarm stimulus.
9. The sleep posture alerting apparatus according to claim 3 , wherein the location of the second alarm stimulus on the body is different from the location of the first alarm stimulus on the body.
10. The sleep posture alerting apparatus according to claim 1 , wherein the control unit is further configured to send a pre-warning signal to the alarming device causing the alarming device to generate a pre-warning alarm stimulus as an introduction for the person that the plurality of alarm stimuli is upcoming, wherein the pre-warning signal has not the intention to evoke an active reaction of the user.
11. The sleep posture alerting apparatus according to claim 10 , wherein at least one selected from the group consisting of a strength, a type, and a location of the pre-warning stimulus is dependent on the at least one selected from the group consisting of a strength, a type, and a location of the plurality of alarm stimuli.
12. The sleep posture alerting apparatus according to claim 1 , wherein the alarming device is configured to automatically change a characteristic of the plurality of alarm stimuli during an end of a night.
13. The sleep posture alerting apparatus according to claim 12 , wherein the alarming device is configured not to generate the plurality of alarm stimuli during the end of a night.
14. The sleep posture alerting apparatus according to claim 1 , wherein the electronic control unit is further configured to receive a pause signal and pause operation of the apparatus based on the pause signal.
15. The sleep posture alerting apparatus according to claim 1 , wherein the electronic control unit is further configured to receive a reset signal and reset at least one of the alarm signal, the change signal, the predefined posture range and the predefined margin.
16. The sleep posture alerting apparatus according to claim 1 , wherein the body posture detecting sensor is a three-axes micro-electro mechanical system-based accelerometer.
17. The sleep posture alerting apparatus according to claim 1 , wherein the alarming device is at least one selected from the group consisting of a vibration motor, an LED display, and a speaker.
18. A sleep posture alerting apparatus for a person, comprising
an electronic control unit;
a body posture detecting sensor operatively connected to the electronic control unit and configured to detect a posture of a body of the person and generate a plurality of posture signals based on the posture;
a memory operatively connected to the electronic control unit;
a timer operatively connected to the electronic control unit; and
an alarming device operatively connected to the electronic control unit and configured to generate a plurality of alarm stimuli;
wherein the electronic control unit is configured to
receive a first posture signal from the body posture detecting sensor,
determine whether the body exited a predefined posture range based on the first posture signal,
generate an alarm signal if the body exited the predefined posture range,
send the alarm signal to the alarming device causing the alarming device to generate a first alarm stimulus to alert the person,
start the timer based on the alarm signal,
receive a second posture signal from the body posture detecting sensor based on a change of the posture of the body of the person,
determine a current reaction time between the start of the timer and receiving the second posture signal,
store the current reaction time in the memory,
determine an average reaction time based on at least one previously determined and stored reaction time,
determine whether the difference between the current reaction time and the average reaction time is outside a predefined margin,
generate a change signal if the difference between current reaction time and the average reaction time is outside the predefined margin,
send a change signal to the alarming device causing the alarming device to generate a second alarm stimulus to alert the person, wherein the second alarm stimulus is different than the first alarm stimulus, and
send a pre-warning signal to the alarming device causing the alarming device to generate a pre-warning alarm stimulus as an introduction for the person that the plurality of alarm stimuli is upcoming, wherein the pre-warning signal has not the intention to evoke an active reaction of the user.
19. The sleep posture alerting apparatus according to claim 18 , wherein at least one selected from the group consisting of a strength, a type, and a location of the pre-warning stimulus is dependent on the at least one selected from the group consisting of a strength, a type, and a location of the plurality of alarm stimuli.