An article today remind me the old discussion about sleep phenomenon "鬼压身" between us.
It seems this kind of experience is remarkably common and has its academic name: Sleep paralysis. It is a period of transient, consciously experienced paralysis either when going to sleep or waking up. During an episode the individual is fully conscious, able to open their eyes but aware that it is not possible to move limbs, head or trunk. There may be also be the perception of respiratory difficulties and, understandably, acute anxiety. In addition, the individual might experience hallucinations including proprioceptive、tactile、auditory hallucinations、visual hallucinations、olfactory or gustatory hallucinations.
It appears that up to 50 per cent of the population will experience sleep paralysis in one form or another at least once in their lifetime, and some people experience it far more often than that.
Throughout the world it has been interpreted with a diverse and colourful range of terms and cultural explanations:
Ghost oppression —— China
‘Old Hag’ —— Newfoundland
attacks from ‘shaman or malevolent spirits’ —— the Inuit of Canada
kanashibari —— Japan
kokma —— St Lucia
ha-wi-nulita —— Korea
‘witch-ridden’ —— Europe, from the 1500s until the 1700s
succubus (attacks by sex-crazed demons in female form)/incubus (in male form)—— Europe, Middle Ages
Sleep paralysis can be considered to be an intrusion of rapid eye movement (REM) sleep characteristics into wakefulness. Shiftwork, jetlag, irregular sleep habits, overtiredness and sleep deprivation are all considered to be predisposing factors to sleep paralysis.
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