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

Alarmy - World's most annoying alarm app

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.

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.

Barcode Alarm Clock - Alarm clock that won't stop ringing until you scan a barcode

Sleep Watch - AI-powered, personalized insights about your sleep.