If you change the battery usage of an app toRestricted, and then try to add this app to theDeep Sleeping list, you'll notice that the app doesn't show up in the list, i.e. you won't be able to add this app to the list.
If you add an app to the Deep Sleeping list, the battery usage for that app is automatically changed toRestricted.
Once an app is in Deep Sleep, it may not show up in various context menus. For example, if a browser app is in deep sleep, and you want to change your default browser to this app, you'll see that the app doesn't show up in the list of browsers. When that happens, simply launch the app manually first to wake it up from Deep Sleep, and then try to change the default browser.
