http://www.omron.co.jp/press/2012/02/h0229_2.htmlThe electro-magnetic sensor detects slight chest movements and other bodily movements made while asleep. When installed next to the bed, it can determine whether a person is asleep or awake, and data from the measuring device can then be further used to visualize the person’s sleeping condition and analyze his sleeping trends. This is useful for improving quality of sleep.
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