Why Sleep Paralysis Makes You See Demons | Smartest Year Ever (Oct 29, 2025)

During Fright Facts Week, Gordy dives into one of the most chilling experiences the human brain can produce — sleep paralysis, the terrifying moment when your mind wakes up but your body doesn’t. For centuries, people thought it was a demonic visitation, a witch sitting on your chest, or a night hag haunting your dreams. Science calls it REM atonia, but that doesn’t make it feel any less like the real nightmare.

In this episode, Gordy explores the psychology, neurology, and cultural history behind sleep paralysis — from the Old English “mare” that gave us the word nightmare, to modern sleep studies uncovering why our brains conjure such vivid hallucinations. You’ll learn how REM dissociation creates the overlap between dream and wake states, and why the shadowy figures and chest pressure so many people report are all part of the same ancient, universal fear response.

Whether you’ve felt that eerie paralysis yourself or you’re just fascinated by sleep disorders, hallucinations, and the science of nightmares, this one’s a perfect watch for spooky season.

Music thanks to Zapsplat.

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Sources:

• Cheyne, J. A., Rueffer, S. D., & Newby-Clark, I. R. (1999). Sleep paralysis: Historical, psychological, and medical perspectives. Journal of Sleep Research, 8(4), 319–326.
  

• American Academy of Sleep Medicine. (2020). REM Atonia and Sleep Paralysis Overview.
  

• Jalal, B., & Hinton, D. E. (2015). Sleep paralysis among different cultures: A comparison of incidence and explanations. Transcultural Psychiatry, 52(4), 579–596.
  

• Oxford English Dictionary. (n.d.). Nightmare (Old English mare).
  

National Institutes of Health. (2020). Prevalence and Mechanisms of Sleep Paralysis.