The best app for playing music when you want to fall asleep. Set a sleep timer, pick a playlist and play. You can poke the device or gently shake it if you are not sleeping to reset the timer. The sound will automatically fade out when the timer expires.

You can play any audio you like - music, podcasts and audiobooks.

The app has a beautiful minimalistic user interface, so you will not be distracted while falling asleep.
Sleep Player Plus is iOS7 compatible and can run in the background.