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Sleep detecting apparatus

  • US 5,479,939 A
  • Filed: 04/06/1994
  • Issued: 01/02/1996
  • Est. Priority Date: 03/09/1990
  • Status: Expired due to Term
First Claim
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1. An apparatus which operates to sense a condition indicative of sleep, comprising:

  • an infrared ray emitter and sensor assembly for radiating infrared rays over a bed on which a human body is located, and for detecting a characteristic of infrared rays and for outputting a detection signal which is generated by said characteristic and indicative of moving of said human body, said detection signal being proportional to an amount of movement of said human body;

    a comparator for comparing said detection signal to a predetermined value indicative of rough body movement;

    a timer for measuring a time interval during which said human body is in a substantially motionless condition on the basis of said detection signal, said time interval being interrupted when a level of said detection signal exceeds said predetermined value, said substantially motionless condition indicating that said human body is asleep, andsleep judging means for outputting an electrical signal indicating that said human body is asleep when said time interval exceeds a predetermined time period.

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