You can set your phone to adjust the screen colours depending on the changing daylight. You can also create a colour change schedule or adjust the colour temperature.
Press Settings.
Press Display & Brightness.
Press Night Shift.
Press the indicator next to "Scheduled" to turn on the function and follow the instructions on the screen to select the required period of time for Night Shift.
Press the indicator next to "Manually Enable Until Tomorrow" to turn on Night Shift immediately.
Press and drag the indicator below "COLOUR TEMPERATURE" right or left to select the required colour temperature.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.