night owl

noun Informal.
a person who often stays up late at night; nighthawk.

1585–95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
night owl or night hawk
informal a person who is or prefers to be up and about late at night
night hawk or night hawk

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

night owl
"owl which flies at night," 1593; applied since 1846 (Amer.Eng.) to persons who are up or out late at night. Similarly, night-hawk, used since 1611 of various birds; fig. sense of "one who seeks prey at night, one who stays up late" is from 1818. Cf. Fr. hirondelle de nuit "prostitute," lit. "night-swallow."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

night owl

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.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
One is a night owl who likes to do business after midnight.
Night owl spectators watch from a pier as the shuttle blasts off.
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