sleepwalk

[sleep-wawk]
verb (used without object)
1.
to engage in sleepwalking.
noun
2.
an act of sleepwalking; somnambulation.

Origin:
1920–25; back formation from sleepwalking

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sleepwalk (ˈsliːpˌwɔːk)
 
vb
(intr) See also somnambulism to walk while asleep
 
'sleepwalker
 
n
 
'sleepwalking
 
n, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
When people sleepwalk, they may sit up and look as though they are awake when they are actually asleep.
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