Sleep Cycle is $0.99, and is an intriguing app. It monitors your sleep depth, and wakes you up within 30 minutes of your desired alarm time (never after..) when you are at your least deep level of sleep. You wake up without that horrible dead tired feeling that results from being woken from a deep sleep.
It's also useful to look at your sleep patterns and see if, overall, you are getting enough of the needed deep sleep.
Well worth $0.99, seems to do a good job of calibrating over the first few days to give you accurate info, and thus wake you up at an appropriate time.
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-Scott
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