Ellipsis of good night.

To spend a night (in a place), to overnight.

(countable) The period between sunset and sunrise, when a location faces far away from the sun, thus when the sky is dark.

plural of nightful

Pertaining to the night; occurring at night, found at night, resulting from the night, night-like, etc.

All that occurs or is done during a single night. / As much as is produced or consumed throughout an entire night.

plural of to-night

present participle of night

During the night.

To work night shifts.