If you selected a color mode, it will resume outside of night hours.
Your phone can automatically filter out blue light and adjust screen colors to warmer tones at night, making it easier to view and read in dim light. You might even fall asleep more easily.
When Night Display is adjusting colors, you'll see
in the status bar.
Swipe the status bar down and touch the
notification, then switch Night Display off.
To turn it off anytime: