Shorten the length of time before your device goes to sleep
In the device settings, tap Display.
Tap Sleep, and then tap 15 seconds or 30 seconds.
Tip: If you don't want the screen turning off when you're in the middle of something, such as reading an article, your device
can recognize when you're holding it in your hand and keep the screen on. In the device settings, tap Advanced
Interactions. Turn on the Hold to stay awake switch.