Sleepwalking

Sleepwalking, also known as somnambulism or noctambulism, is a phenomenon of combined sleep and wakefulness. It is classified as a sleep disorder belonging to the parasomnia family. It can also be understood as a disorder of state dissociation, which features of wakefulness and deep non-REM sleep occurring simultaneously in different brain regions.

It occurs during the slow wave stage of sleep, in a state of low consciousness, with performance of activities that are usually performed during a state of full consciousness.
These activities can be as benign as talking, sitting up in bed, walking to a bathroom, consuming food, and cleaning, or as hazardous as cooking, driving a motor vehicle, violent gestures and grabbing at hallucinated objects.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain