Can I build an Android app that stops games when I fall asleep?

The simplest solution may be changing the habit or using the phone’s built-in app and screen-time controls, since they can sometimes force a game to stop after a limit. Also check whether the game booster has settings for keeping the screen awake, preventing sleep, or limiting charging temperature. A third-party automation app may not be able to override every manufacturer restriction.

If you’re using Android, MacroDroid may be worth trying. It can detect when a particular app is opened, start a timer, show prompts, and perform actions such as going to the home screen or locking the device. You may need to grant accessibility and battery-related permissions, and some actions can vary depending on your phone manufacturer.

AI can help generate parts of an app, but it won’t remove the need to understand Android permissions, background activity, timers, overlays, and device-specific restrictions. For someone starting from zero, a no-code automation app is probably much easier to test. If that cannot do everything you need, a developer could build it, but you should write down the exact timer behavior and which actions the app must perform first.