Night Shift automatically changes the your display output to warmer colors after dark.
If you're accessing Night Shift settings from the Control Center, begin with step 2.
From the Home screen, navigate: Settings > Display & Brightness > Night Shift.
To set up a time schedule for Night Shift, tap the Scheduled switch to turn on or off .
You can also choose to start Night Shift immediately by tapping the Manually Enable Until Tomorrow switch just below the Scheduled section.
Tap the From/To field then tap one of the following (enabled when a check mark is present):
Sunset to Sunrise
If you choose this option, enter the start and end times just below Custom Schedule.
Tap Night Shift (upper-left) to return to the previous screen.
If desired, slide the bar near the bottom of the screen to adjust the warmth of the colors.