2. Hallucinations

Art history is full of works depicting someone sleeping with a demon on their chest or a dark, menacing figure hovering above. While dramatic, some experts believe these terrifying visualizations could, in part, be a result of a sleep paralysis episode. Researchers have found that during sleep paralysis, select serotonin receptors are activated, causing vivid, frightening hallucinations.

hallucination fear demonic serotonin receptors Likozor / Getty Images


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