AlarmDroid - AlarmDroid is an alarm application that is only available on Android devices and possesses many interesting features.

Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.

Google Clock - Google Clock is an application of Google Inc.

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.

Sleep Better - Track sleep cycles, monitor dreams & improve bedtime habits

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.