This is something new to me. My daughter was telling me that her son in college did this.
You download the program and set the alarm, then you put it under your bed sheet or pillow.. It senses your sleep cycles and wakes you in your lightest cycle..it also shows a graph of your sleep cycles.
I wonder if you can do this with any phone?
http://itunes.apple.com/app/sleep-cycle-alarm-clock/id320606217?mt=8
Snoozy