Time to call it a night

Time to call it a night.

It's time to quit one's activities for the night. (Can refer to work or partying.) Bob: Wow, it's late! Time to call it a night. Mary: Yes, it's really dark! Good night. Fred: Gee, I'm tired. Look at the time! Jane: Yes, it's time to call it a night.
See also: call, night, time