Centuries ago, someone would have called it a night hag, but the sensation is pretty much identical. This reveals something important about the human mind. The biological portion – how the brain skews consciousness and muscle control – is the same for everyone. But the interpretation of the experience is derived from culture, upbringing, and belief. People who believe in spirits tend to have more vivid and terrifying episodes.
Those who know the science are less frightened, and recall the experience differently. Sleep paralysis isn’t just a quirk of the brain. It expresses the fears, narratives, and social attitudes that we harbor. A momentary malfunction of the brain can snowball into a fully flesh-and-blood experience that feels entirely real and deeply personal.