sleeptracker program idea

[chaofun]

Has anyone tried using a sleep tracker watch before?

From what I can tell when I sampled one, it works by sensing movement with its accelerometer. It's supposed to help you wake up feeling more refreshed by waking you when you move and make the accelerometer react. This makes sense because when you are moving, you are in a lighter stage of sleep (vs when you are in deep sleep, your body would be more still).

Since our TP's have an accelerometer, I had an idea for a sleeptracker program on our phones. By keeping the phone close to your body, it could sort of be like a watch and react to one's body movements.

Does anyone know how to create such a program? Or any feedback to this idea?