Recently, there is growing interest in achieving better sleep quality. Therefore, this research is investigating appropriate stimuli in response to sleep depth, and suggests an interface to improve the quality of sleep. We have developed an application that reports sleep depth by using a smartphone to detect the body motion of the user during sleep. This app sends the measured data to a PC. Moreover, the app provides light and sound stimuli in line with the measured sleep depth and suggests a pillow-type device that may improve the quality of sleep.


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