The action of walking and performing other activities while asleep, without conscious awareness or memory of doing so.
A compound of 'sleep' (Old English 'slæp') and 'walking' (Old English 'wealcan'). The condition was medically described in the 18th century, though the phenomenon is ancient and appears in many cultures.
Sleepwalkers aren't dreaming or remembering what they do because sleepwalking happens during deep non-REM sleep—the parts of the brain that control movement are active while the parts handling consciousness and memory are offline, creating this bizarre split.
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