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sleepwalking

[sleep-waw-king] /ˈslipˌwɔ kɪŋ/
noun
1.
the act or state of walking, eating, or performing other motor acts while asleep, of which one is unaware upon awakening; somnambulism.
adjective
2.
of or pertaining to the state of walking while asleep; somnambulistic.
Origin
1790-1800
1790-1800; sleep + walking
Related forms
sleepwalker, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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sleepwalker in Medicine

sleepwalking sleep·walk·ing (slēp'wô'kĭng)
n.
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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Encyclopedia Article for sleepwalker

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.

Learn more about sleepwalking with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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20
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