Sleepwalking
Sleeping phenomenon combined with wakefulness / From Wikipedia, the free encyclopedia
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Sleepwalking, also known as somnambulism or noctambulism, is a phenomenon of combined sleep and wakefulness.[1] It is classified as a sleep disorder belonging to the parasomnia family.[2] It occurs during 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,[3][4][5] violent gestures and grabbing at hallucinated objects.[6]
Sleepwalking | |
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John Everett Millais, The Somnambulist, 1871 | |
Specialty | Clinical psychology, Psychiatry, sleep medicine |
Although sleepwalking cases generally consist of simple, repeated behaviors, there are occasionally reports of people performing complex behaviors while asleep, although their legitimacy is often disputed.[7] Sleepwalkers often have little or no memory of the incident, as their consciousness has altered into a state in which memories are difficult to recall. Although their eyes are open, their expression is dim and glazed over.[8] This may last from 30 seconds to 30 minutes.[6]
Sleepwalking occurs during slow-wave sleep (N3) of non-rapid eye movement sleep (NREM sleep) cycles. It typically occurs within the first third of the night when slow-wave sleep is most prominent.[8] Usually, it will occur once in a night, if at all.[6]