Sleeper

Turning on the airplane mode at night allows you to save 30% of the battery.The application automates the process of switching your phone to airplane mode at the in a specified time. You just need to set the time for turning on and off airplane mode, and the daily, application will perform a switching operation.

Without advertising! Absolutely free! Doesn't need rooting!

How to use the application:
Install the application, run it, set the time on/off and press the button, close the application.