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.
Sleepy Baby - Help your baby sleep with the Sleepy Baby soundboard.
Sleepedy - Personal sleep coaching & therapy
MyNoise - Custom shaped online noise machines. Many Many generic sounds
Pzizz - Sleep at the push of a button! Now with "Focus"
Power Nap App - Best napping timer with relaxing sleep sounds