While I have enjoyed the SleepCycle app, this particular app is a disappointment. I expected the sleep under this app to integrate the data into my sleep patterns. Unfortunately, if I take a nap and use SleepCycle, it skews the data. I had hoped to keep separate data with this particular app. Also, as another reviewer indicated I do not move when I take a nap. Therefore this app does not work the way it should. My body is and has been far superior in waking me after a 20 minute power nap. My suggestion is to pass on this particular app.
AngelNap about Sleep Cycle power nap