"Most cases unfold as follows: A person wakes up paralyzed and perceives an evil presence. A hag or witch then climbs on top of the petrified victim, creating a crushing sensation on his or her chest...Sleep paralysis embodies a universal, biologically based explanation for pervasive beliefs in spirits and supernatural beings, even in the United States, Hufford argues. The experience thrusts mentally healthy people into a bizarre, alternative world that they frequently find difficult to chalk up to a temporary brain glitch...."
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Sleep paralysis is the condition when, during sleep, one wakes up suddenly and can't move a muscle. It is also called bangungot in tagalog.
