Plays you a lullaby when you get to bed to help you fall asleep better.
For lullabies, you can use built-in Nature sound lullabies, your own music, Spotify, online radio, or you can mix in binaural beats. You can listen to your favourite music the whole night, or let the app control the volume and gradually lower it to zero after you started falling asleep with Turn off when sleeping feature.
This is a companion discussion topic for the original entry at https://sleep.urbandroid.org/docs/sleep/lullaby.html