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Sleep paralysis locks a person in a weird state between waking and dreaming, where they can't move but might experience odd hallucinations.
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▼ People may wake in the middle of the night and find themselves unable to move or utter a sound. They might see a shadowy figure hovering in the corner, feel a pressure on their chest or sense a hand around their throat. Other times, they feel removed from their frozen bodies, as if floating out of their bed sheets. These bizarre experiences are known as sleep paralysis, a diagnosable and fairly common sleeping disorder.
Prevalence through history
References to sleep paralysis are scattered throughout history, though not usually under the name "sleep paralysis." Folklore and mythsfrom around the world describe the terrifying experience of being unable to move upon waking and sometimes seeing beings, being choked or being held down. Nightmares known as the "Old Hag" in Newfoundland, Kokma in St. Lucia, and tsog in East Asia may have all be borne of the same spooky experience, according to an article in the Journal of the Royal Society of Medicine. In 1664, a Dutch physician described a patient's experience of sleep paralysis as the "Incubus or the Night-Mare," providing the first known clinical description of the affliction.
According to a 2011 review, about 7.6% of the world's population experiences at least one episode of sleep paralysis in their lifetime, with higher rates noted among students and psychiatric patients, particularly those with post-traumatic stressor panic disorder. Sleep paralysis is also a common symptom of narcolepsy, a condition characterized by excessive sleepiness, sleep attacks and sudden loss of muscle control, as described by the National Sleep Foundation. Sleep paralysis in the absence of narcolepsy is known as "isolated sleep paralysis," or "recurrent isolated sleep paralysis" if it occurs repeatedly.
Temporary paralysis and vivid hallucinations (▪ ▪ ▪)
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