SleepSense: A Noncontact and Cost-Effective Sleep Monitoring System

Abstract

Quality of sleep is an important indicator of health and well being. Recent developments in the field of in-home sleep monitoring have the potential to enhance a person's sleeping experience and contribute to an overall sense of well being. Existing in-home sleep monitoring devices either fail to provide adequate sleep information or are obtrusive to use. To overcome these obstacles, a noncontact and cost-effective sleep monitoring system, named SleepSense, is proposed for continuous recognition of the sleep status, including on-bed movement, bed exit, and breathing section. SleepSense consists of three parts: a Doppler radar-based sensor, a robust automated radar demodulation module, and a sleep status recognition framework. Herein, several time-domain and frequency-domain features are extracted for the sleep recognition framework. A prototype of SleepSense is presented and evaluated using two sets of experiments. In the short-term controlled experiment, the SleepSense achieves an overall 95.1% accuracy rate in identifying various sleep status. In the 75-minute sleep study, SleepSense demonstrates wide usability in real life. The error rate for breathing rate extraction in this study is only 6.65%. These experimental results indicate that SleepSense is an effective and promising solution for in-home sleep monitoring.

Sleep Information Gathering Protocol Using CoAP for Sleep Care

“…Figure 1a shows a sleep care device that measures sleep information through various sensors. The sound sensor attached to the user detects the sleep state of the user by detecting the sounds of snoring or tossing and turning, and measures the sleep environment through a temperature and humidity sensor [13,14].…”

A Novel Vital-Sign Sensing Algorithm for Multiple Subjects Based on 24-GHz FMCW Doppler Radar

“…Non-contact vital sign sensors have the distinct advantage of possible continuous monitoring without patient perception; hence, they can be used for monitoring patients at risk of sudden infant death syndrome (SIDS) or sleep apnea [8,9]. In addition, they can be used as a home care service for the elderly through continuous monitoring system [10,11]. Furthermore, they can be used for a driver monitoring system for detecting and alerting drowsy driver [12][13][14][15].…”

915-MHz Continuous-Wave Doppler Radar Sensor for Detection of Vital Signs

“…Radar technology can detect vital signs such as respiration and heart rate without contact electrodes [1]. Among various noncontact vital-sign detectors, the radar sensor has advantages for various industrial applications, such as driver-status monitoring, human-motion recognition, passenger detection systems, and smart home appliances, owing to its operating principle of not infringing on privacy and the difficulty of detecting sensor operation [1][2][3]. A continuous-wave (CW) radar, which transmits and receives continuous signals and measure vital signs according to changes between transmitted and received signals, can be implemented using simple front-end configuration with a single operating frequency in a narrow bandwidth and can easily remove stationary clutter [4][5][6][7].…”