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System for monitoring sleep efficiency

  • US 10,368,797 B2
  • Filed: 05/07/2018
  • Issued: 08/06/2019
  • Est. Priority Date: 05/12/2017
  • Status: Active Grant
First Claim
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1. A system for monitoring sleep efficiency, comprising:

  • a measuring device for measuring body temperature of a subject and for outputting temperature data associated with the body temperature; and

    a data processing device coupled with said measuring device for receiving the temperature data therefrom, and programmed to process the temperature data so as to determine sleep efficiency;

    wherein the processing of the temperature data includes constructing a curve of the body temperature over a sleep episode, finding a saddle point of the curve occurring for a first time, treating a time instance at which the saddle point occurs as a sleep-onset time point at which the subject falls asleep, and determining the sleep efficiency according to the sleep-onset time point;

    wherein said data processing device is programmed to process the temperature data to further define an into-bed time point as a time instance at which said measuring device is activated to measure the body temperature of the subject, and said data processing device determines the sleep efficiency based on the into-bed time point and the sleep-onset time point;

    wherein said processing device is further programmed to;

    obtain an initial degree of the body temperature at the into-bed time point;

    determine an awakening time point at which the subject awakens from sleep as a time instance when the body temperature rises and stays above the initial degree until the end of the sleep episode; and

    calculate a total sleep time based on the into-bed time point and the awakening time point.

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