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A person who prefers to be awake late at night. In my younger days, I was quite a night owl and would often stay up until sunrise.
Fig. someone who stays up at night; someone who works at night. My roommate is a night owl and usually reads until 5:00 A.M. A few night owls stayed at the café all night long.
A person who habitually stays up late and is active at night, as in You can call her after midnight, for she's a night owl. This colloquial term, originally used in the late 1500s for an owl that is active at night, was transferred to nocturnal human beings in the mid-1800s.
a night owl
If you call someone a night owl, you mean that they regularly stay up late at night. Night owls can even order a 3am steak at the 24-hour Horizons Court Hotel. Joe is a night owl whereas I'm more of an early bird.