At Night. In Your Bed. In the Dark.
Shadow people. Inability to move. Levitation to the ceiling. Electrical Light shows.
Hags. Black cats with red eyes.
I've been hearing these stories for years. And we humans have been experiencing these Nighttime Terrors long before I set foot on the planet.
Here's Henry Fuseli's painting on the phenomenon from 1781:
"The Nightmare" which is currently available on your favorite Streaming Service.
And here's Fifteen Experiences thanks to Chrissy Stockton.
Are you a little bit hooked?
Some more useful links:
From Scientific American
Why others think it's demonic.
A Sleep Paralysis Study
And from True Ghost Tales
And finally a popular Video of a purported "Shadow Man " capture: