ˈnight owl noun [countable] informal
someone who enjoys staying awake all night

[TahlilGaran] Dictionary of Contemporary English ▲

night owl
someone who often goes to bed late because they prefer to do things at night.
A night owl from his youth, he is rarely in bed before 4 o'clock.

[TahlilGaran] English Idioms Dictionary ▲

night owl
a person who likes to stay up late at night
My friend is a night owl and he loves to stay up late at night.

[TahlilGaran] English Idioms Dictionary ▲

night owl
n. phr. One who sleeps during the day and stays up or works during the night.
Tom hardly ever sleeps at night; he prefers to work by lamp light and has become a regular night owl.
Compare: GRAVEYARD SHIFT.

[TahlilGaran] English Idioms Dictionary ▲