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Re:Sleep Cycle aware Alarm Clock App using iPhone Accelerometer by bioweek on Friday January 08, 2010 @11:09AM (#1039780)
How did they figure out how to make this, e.g., what movements constitute different sleep states? Are there research papers on this?

I wonder if you could use changes in body temperature instead? (Obviously not using an iPhone though.)

Re:Sleep Cycle aware Alarm Clock App using iPhone Accelerometer by eru on Friday January 08, 2010 @11:11AM (#1039784)
There are some papers about it. Look at the discussion for the wakemate, a month ago or so.