keep late hours

keep late hours idiom
Stay awake until late at night. For example, Never call Ethel before noon; she keeps late hours and sleeps all morning.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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