By default, all Chromebooks automatically go to sleep if left inactive for 6 minutes when unplugged (it’s 8 minutes if it is plugged in). And while you can adjust the brightness level of the screen, you cannot tweak display timeout settings on Chrome OS. That is, you cannot do so without a Chrome Extension, like Keep Awake. By following these instructions, you’ll be able to keep your Chromebook from going to sleep.
1. Navigate to chrome.google.com/webstore.
2. Search for Keep Awake and click Free.
3. Click Add in the pop-up.
Once Keep Awake is installed a tiny moon will appear on the right side of your Chrome browser. As long as the moon is the icon, the Chromebook’s display settings will remain unchanged.
4. Tap the moon to change it into a little sun, which indicates that the Chromebook will not go to sleep.
5. Tap the sun to turn it into a sunset picture. The sunset indicates a setting where the Chromebook’s display will go black to save battery power, but the Internet connection will remain active.