Pzizz - Sleep at the push of a button! Now with "Focus"
zenmix.io - Ambient background sound generator
Sleep Watch - AI-powered, personalized insights about your sleep.
Defonic - Create a unique sound environment at home or in the office
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.
SoundDrown - Ambient sounds to help you focus, relax, and escape