Why do people often describe a 'demon' during sleep paralysis?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Why do people see a demon during sleep paralysis? Many people report seeing a "demon" during sleep paralysis because the brain remains partially awake while the body stays immobilized in REM sleep. This state can trigger vivid hallucinations, a sense of pressure on the chest, and intense fear. Cultural folklore—such as tales of night hags, incubi, or shadow figures—shapes how the brain interprets these terrifying sensations, often producing a demonic figure.

While sleep paralysis is usually harmless, recurring episodes can signal underlying sleep disorders, stress, or anxiety worth addressing. If you've experienced this, take a free, instant, online symptom check to better understand what may be causing your episodes and get clear guidance on your next steps. It only takes a few minutes and could help you sleep more peacefully tonight.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Discover if your sleep paralysis needs care Learn likely causes of sleep paralysis See if sleep paralysis could be serious Find OTC options for sleep paralysis symptoms Find a sleep specialist near you Explore safe home remedies for sleep paralysis Understand what causes demon sleep paralysis

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Explanation

Sleep paralysis can be a scary experience because you wake up and can't move your body. Many people feel a heavy weight on their chest and see or sense a scary figure, like a 'demon.' This happens because your brain is still partly dreaming, even though you're awake.

Cultural Stories

Different cultures have stories that explain sleep paralysis.
In some places, people think a ghost or spirit is sitting on them.
These stories make people think of demons when they have sleep paralysis.

Brain and Body

Your brain is still dreaming, so you might see or feel things that aren't real.
Because you can't move, it feels even scarier.

If you find sleep paralysis very frightening or it happens a lot, you might want to talk to someone about it. To better understand your symptoms and get personalized guidance, try Ubie's free AI-powered symptom checker.

(References)

Cox AM. (2015). Sleep paralysis and folklore. JRSM open, 28008370.
de Sá JF, & Mota-Rolim SA. (2016). Sleep Paralysis in Brazilian Folklore and Other Cultures. Frontiers in psychology, 27656151.
Aina OF, & Famuyiwa OO. (2007). Ogun Oru: a traditional explanation for nocturnal .... Transcultural psychiatry, 17379609.

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