Sleep tight? Wake up easy --- iPhone app to help you wake up energized

I don't wake up easy. If you're like me, you'll certainly like this app:
Sleep Cycle alarm clock - appstore link.

With just $.99, it works like a charm. I now sleep less and yet feel less sleepy during the day. Plus it's fun to read the mini report about your own sleep. Here's a short report of my sleep last night. Sent directly from the app.

Sleep statistics for 07 - 08 Feb (Mon).

Went to bed / woke up: 20:28 / 04:07
Total time: 7h 38m

Analysis made by Sleep Cycle.

My sleep graph for the entire night:

Another iPhone app called EasyWakeUp - appstore link does the same thing, with some additional features like: multiple clocks, customized alarm sound (they say you may record and use the sexy voice of your girlfriend) etc. But this one costs approx. 10 times more.

Further reading: Stages of sleep - from Wikipedia