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biorhythms
The audio players should tie into something like the Nike biomonitors, so it can tell when you fall asleep and gradually reduce the volume for 5 minutes before shutting off. If you wake back up, it immediately starts playing again from a couple minutes before you fell asleep.
If it hasn't been patented, it's too late now, since the invention is now described and implementation is trivial to one skilled in the art.
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