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[sleep-waw-king] /ˈslipˌwɔ kɪŋ/
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.
1790-1800; sleep + walking
Related forms
sleepwalker, noun


[sleep-wawk] /ˈslipˌwɔk/
verb (used without object)
to engage in sleepwalking.
an act of sleepwalking; somnambulation.
1920-25; back formation from sleepwalking Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for sleepwalking
  • Sleep disorders such as sleepwalking arise when normal physiological systems are active at inappropriate times.
  • sleepwalking's hazard is more closely linked to what the sleepwalker may encounter when roaming about in a nocturnal reverie.
  • Unfortunately, instrumentality and automatization make us prone to sleepwalking through life.
  • Escape controlling consciousness of the dominant brainwashing powers by sleepwalking.
  • And then there's the story about the time he jumped out of a second-floor hotel room window while sleepwalking.
British Dictionary definitions for sleepwalking


(intransitive) to walk while asleep See also somnambulism
Derived Forms
sleepwalker, noun
sleepwalking, noun, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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sleepwalking in Medicine

sleepwalking sleep·walk·ing (slēp'wô'kĭng)
The act of walking or performing another activity associated with wakefulness while asleep or in a sleeplike state. Also called noctambulism, somnambulism.

sleep'walk' v.
sleep'walk'er n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Slang definitions & phrases for sleepwalking

sleep on something

verb phrase

To postpone a decision on something until the next day, with the implication that a night's sleep will facilitate judgment (1519+)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Encyclopedia Article for sleepwalking

a behavioral disorder of sleep in which a person sits up and performs various motor actions, such as standing, walking about, talking, eating, screaming, dressing, going to the bathroom, or even leaving the house. The episode usually ends with the sleepwalker returning to sleep, with no subsequent memory of the episode. Sleepwalking is most common in children, though it may also appear in adolescents and young adults. It occurs only during deep sleep, when dreams are basically absent. Sleepwalking becomes dangerous only when the possibility exists of the sleepwalker accidentally injuring himself.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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