Recently, sleep evaluation has attracted lots of attention as sleep disorders have become a public health problem that causes cumulative effect on physical and mental health. Poor sleep qualities can lead to adverse effects on performance of basic activities in normal life such as memorization, concertation and learning especially among elderlies. Sleep posture is one of the keys factors that evaluates sleep qualities to prevent medical conditions such as pressure ulcer formation. In this paper, a sleep monitoring system is developed based on an infrared array sensor to detect different sleep postures. Motion and presence detections are performed and achieved an accuracy over 90%. And eleven different postures can be successfully identified with an accuracy above 95% in controlled lab environment. As the infrared array sensor has the unique property of non-contact, non-privacy invasion and passive sensing, it provides an unobtrusive, low cost and convenient method of long-term sleep monitoring.
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