SpotOn Sleep/Wake Timer for Spotify lets you set a timer to fall asleep and wake up to your favorite tracks, albums and playlists.

Fall asleep and wake up to your favorite music
• Play any track, playlist and album from Spotify
• Slowly fade-out music at night and fade-in in the morning
• Use it on your phone or tablet
• Play music on other devices using Spotify Connect

To be added later (as optional)
• Weather forecast
• Low battery warning

...And much more. This is a testing beta so please be patient and send feedback and issues.
From version SpotOn - Sleep & Wake Timer for Spotify 0.1.66 beta:
Fixed the volume level of devices connected through Spotify Connect.
Fixed sound issues when connected to a Bluetooth device
Added sleep timer for Spotify
Added FAQ
All versions