Strange Sleep Disorder Makes People See 'Demons'

Strange Sleep Disorder Makes People See 'Demons' | Real Stories of Sleep Paralysis | LiveScience: "Sleep paralysis happens when people become conscious while their muscles remain in the ultra-relaxed state that prevents them from acting out their dreams. The experience can be quite terrifying, with many people hallucinating a malevolent presence nearby, or even an attacker suffocating them. Surveys put the number of sleep paralysis sufferers between about 5 percent and 60 percent of the population."