Sleep Cycle

Sleep Cycle

Sleep Cycle's purpose is analyze your sleep patterns and wake you up on the most appropiate time (i.e. when you are in your lightest sleep phase). Yep, it works. And being more concious of my sleep (and resting time), I'm making changes in my routine and sleeping better than before. It's the best $0.99 I've paid so far.

There's more information on the theory and workings on their website. Highly recommended.