Sleep Timer is a nifty Android application that lets you turn off any media playing on your phone after a set amount of time. Developed by Sleepy Technologies, it is a free app available for download on Android 9.0 and above.

This app works with all media players and is compatible with Spotify, Youtube, or any other media player of your choice. Simply start playing music from your favorite music app and set the timer. You can also deactivate Bluetooth and/or Wi-Fi after a set amount of time to conserve battery life.

Sleep Timer also helps you save battery life by turning off your screen when the timer runs out. You can easily extend your timer directly from the Notification Center and disable the timer altogether without opening the app.

Please note that the app uses the Device Administrator permission for turning off the screen with the timer. If you wish for this functionality, you must activate it in the app's settings. Some devices may require you to disable device administrator for uninstalling the app, which can be done from the Android Settings at any time.

If you encounter any issues or want something changed in the app, you can contact the developer through email or leave feedback on the app. Sleepy Technologies is committed to making sure the app meets your needs and can be contacted on their Facebook page as well.