Pzizz - Sleep at the push of a button! Now with "Focus"
Sleep App - Relax, meditate & sleep
Rise: Track Sleep & Circadian - Wake up & fall asleep better
Pulse - Pulse is an application that downloads pictures from the internet and uses those images to automatically change your wallpaper.
Enough Sleep - Boost your performance by getting enough sleep!
Sleep as Android - Common alarm clocks ignore your sleep cycles, they wake you on schedule no matter your are currently in your deep sleep. Waking up from deep sleep is unpleasant, it makes you tired and it may negatively affect your productivity during the whole day.