Alarm clock has sleep phase determination using pulse and blood pressure sensor and controller to recognize REM sleep and activate waking alarm after it

摘要

An alarm clock has sleep phase determination using a pulse and blood pressure sensor (1) in a chest belt or arm band to generate a digital signal from arterial blood movements and a control unit (2) recognizing REM (Rapid Eye Movement) sleep phases and signaling their end to the watch (3) which sounds an alarm then or at the end of the preset period.