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Sleep paralysis can last for a few seconds to a few minutes. In rare cases, hallucinations can occur with sleep paralysis, in which the person sees, hears, feels or tastes something that other people do not.
An episode of sleep paralysis can end on its own or if the person is moved. Even though a person may feel like she cannot breathe during sleep paralysis, the paralysis does not affect the muscles used to breathe.
So what causes sleep paralysis? Health Services at Columbia pointed out that people with narcolepsy often have sleep paralysis. About 250,000 people in the United States have narcolepsy, noted the National Institute of Neurological Disorders and Stroke.
Besides sleep paralysis, patients with narcolepsy experience extreme drowsiness every three to four hours during a 24-hour period and a sudden loss of muscle tone, called cataplexy.
Narcolepsy results from less hypocretin, a type of protein.
https://www.empowher.com/paralysis/content/what-are-causes-sleep-paralysis
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Physiological symptoms of sleep paralysis are the same with those of syncope. Thus, sleep paralysis is caused by syncope. For experts in cardiovascular diseases, sleep paralysis or syncope is a common symptoms of cardiovascular disease【1】.For a long time, due to the ignorance of physiological knowledge of syncope , ischemie cerebrale , slow beat, fast beat and so on, psychological illusion in people’s sleep generated by such physical symptoms i.e. the nightmare really has puzzled the psychologists, therefore they put forward a wide range of wrong even absurd views onthe nightmares, which both have no scientific basis, and could not be confirmed, even more were not self-consistent.For example, a medical expert Debacke drew the correct conclusion thatthe anxiety-dream resulted from ischemie cerebrale according to the physiological symptoms of the anxiety-dream of a boy of thirteen. Freudcalled such view was a " medical mythology" in the book of Dream Psychology. Most important,the experiment confirmed the idea.For example, a place in country , there is a "haunted" bed which makes people have sleep paralysis or syncope every night, and it is this fact that the pillow in the bed is too high will reduce cerebral blood flow.
【1】http://www.medhelp.org/posts/Sleep-Disorders/Nocturnal-fainting/show/11612
January 17, 2013 - 12:06amThis Comment