the act or state of walking, eating, or performing other motor acts while asleep, of which one is unaware upon awakening; somnambulism.


of or relating to the state of walking while asleep; somnambulistic.

Origin of sleepwalking

First recorded in 1790–1800; sleep + walking
Related formssleep·walk·er, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for sleepwalker

Contemporary Examples of sleepwalker

Historical Examples of sleepwalker

  • And at those words I rose mechanically, and like a sleepwalker.

    A Strange Story, Complete

    Edward Bulwer-Lytton

  • Scaring 'em to death with that in your hand like a sleepwalker in traveling-tweeds!

    A Case in Camera

    Oliver Onions

  • But that girl was like a sleepwalker—not to be talked to, I mean, like you could talk to persons.

    Somewhere in Red Gap

    Harry Leon Wilson

  • She did not speak at all, but after the first glance about her moved like a sleepwalker.


    Mary Johnston

  • The girl moved with the absorption of a sleepwalker beside Jude whose shufflings bespoke nervous tension.

    Joyce of the North Woods

    Harriet T. Comstock

sleepwalker in Medicine




The act of walking or performing another activity associated with wakefulness while asleep or in a sleeplike state.noctambulism somnambulism
Related formssleepwalk′ v.sleepwalk′er n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.