Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
Pzizz - Sleep at the push of a button! Now with "Focus"
Sleep Time - Alarm Clock - Sleep Time provides insight into your sleep patterns. By tracking your level of movement throughout the night, Sleep Time generates customized sleep data in easy-to-read charts.
Rise: Track Sleep & Circadian - Wake up & fall asleep better
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.
Enough Sleep - Boost your performance by getting enough sleep!