Like Fitbit, Up sports a step tracker that keeps tabs on distance, pace, calories burned and active time versus hours logged in front of the computer sedentary periods. The band, available in seven colors, is also sweatproof, though the jury's out on how comfy it'll be during an hour-long run. But its killer feature could well be a sensor that detects what stage of sleep you're in, and uses a vibrating motor to wake you up when you're in a light sleep state. So, if you set your alarm for 7:30, it might rouse you slightly earlier if it knows your brain isn't availing itself of some sweet REM.
Engadget, Jawbone Up detailed: tracks activity, food intake and sleep cycles, available November 6 for $100 (video)
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