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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]
Parasomnias like sleepwalking and talking typically occur during the first part of an individual's sleep cycle, the first slow wave of sleep [63] During the first slow wave of sleep period of the sleep cycle the mind and body slow down causing one to feel drowsy and relaxed. At this stage it is the easiest to wake up, therefore many children do ...
Usually they experience amnesia after the event but it may not be complete amnesia. Up to 3% of adults have sleep terrors and exhibited behavior of this parasomnia can range from mild to extremely violent. This is very prevalent in those who have violent post-traumatic stress disorder (PTSD). [10] They typically occur in stage 3 sleep. [20]
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Unlike REM sleep, there is usually little or no eye movement during these stages. Dreaming occurs during both sleep states, and muscles are not paralyzed as in REM sleep. People who do not go through the sleeping stages properly get stuck in NREM sleep, and because muscles are not paralyzed a person may be able to sleepwalk.
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While slow waves and sleep spindles are present in stages 2 and 3, stage 2 sleep is characterized by a higher prevalence of spindles, while slow waves dominate the EEG during stage 3. [ 22 ] [ 21 ] Slow-wave sleep is an active phenomenon probably brought about by the activation of serotonergic neurons of the raphe system.
A 10-year-old girl got lost in dense Louisiana woods after sleepwalking out of her home — before being saved thanks to a helpful drone operator who spotted her using thermal images.