In case it still happens, focus on your breathing and try to move just one finger or toe. Bit by bit, your body will loosen up and movement will return.
The thing about sleep paralysis is that it is one of those experiences where biology and belief collide in a powerful way.
Across cultures and centuries, people rarely thought of sleep paralysis as of a neutral bodily glitch. Instead, people tried to interpret it through the system of beliefs they already relied on to make sense of danger, mystery, and things they couldn’t see or explain.
Before modern sleep science became available, this experience was just too intense to be written off as imagination. People would wake up fully aware but frozen in place, struggling to breathe, and feeling like someone or something was present in the room with them. It was then that they turned to their system of beliefs.
In medieval Europe, superstition and religion were simply a huge part of daily life, and this particular phenomenon became wrapped into tales of witches and demons. The feeling of being held down at night and unable to scream was taken as evidence that evil entities were visiting the person during sleep. Stories of the “night hag”—a dark, witch‑like figure that sat on people’s chests as they slept—were common in England, Scandinavia, and other regions of Europe.
Church documents and folklore narratives describe the night hag coming in the night, pressing down her prey with an unseen weight and blowing fear into their ear.
People didn’t think, “Oh, maybe this is my nervous system misfiring.” They thought something truly supernatural had entered their bedroom without warning and that it was there to cause them harm. The night hag wasn’t just a metaphor but a real creature in the shared imagination of the time, a being that explained why good, ordinary people could wake up feeling hunted and powerless.
Travel a little farther south and east, and you see similar experiences told in entirely different terms and it wasn’t because the core experience changed, but because the interpretive lens was shaped by different cultural beliefs.