Adjust the screen from blue to a warmer color to help reduce eye strain when viewing it at night. 
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From the Home screen, swipe up and then tap . 
			 
- Tap Night mode, and then tap its On/Off  switch to turn this feature on.
- Drag the slider to adjust the color temperature. Dragging the Intensity slider to the right filters out more blue light.
- Tap Turn on automatically to set a schedule when to turn on the feature.
- After you've set a schedule, tap the On/Off switch to turn it off. Your phone will then follow the schedule you've set.