Servicely is an app that lets you put any app on your device to 'sleep' so that it doesn't waste any of your battery unnecessarily when your screen is turned off. This can be especially useful to prevent some of the usual offenders - like Google Play Services and Facebook - from draining your battery all night, for example. It also helps you stop any game from sending constant notifications.
To use Servicely, your Android device needs to be 'rooted.' Once that's out of the way, the app is really easily to use. All you have to do is select the apps or processes you want to deactivate when your screen's off. That's right, you can deactivate any process that's sucking your battery dry.
Servicely is a really interesting app that's especially useful if you use it along with other apps like Wakelock Detector. This way you can quickly detect what app or process is draining your battery and put it to sleep.