Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
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 Calculator - Want to wake up in a good shape?
Alarm Klock - A better alarm clock.
Pillow for iOS - An iOS companion that helps you sleep better 💤
Pokémon Sleep - This sleep app gives you something fun to look forward to when you wake up in the morning.