Mostly likely a demon, but by some explanations a UFO, "the Hatman" is a shared vision that people from all parts of the world are having related to sleep. Famously, he was mentioned by Aaron Rodgers who saw him after a 2005 drug trip.
“It was behind me, not even breathing hard. I heard its feet hitting the ground in a constant rhythm. I ran to my car, opened the door, slammed it behind me and locked it as fast as I could.”
Materialist explanation here (6 minute YouTube video): https://youtu.be/iYbA6Tjux24
Decent blog post here, the entrance to the rabbit hole: https://thereversion.substack.com/p/enter-hatman
Down the rabbit hole: https://thehatmanproject.com/
you know why witches were thought to be able to fly? it's a common out of body experience that occurs when you struggle to escape the sleep paralysis. it feels very much like what the people who trip on hallucinogenic drugs describe - some half stage realm between our reality and dream. I like to think of it as a frequency issue, your brain messes up when dropping from wakefulness to sleep, there's a hitch where you start registering at incorrect frequency and you suddenly find yourself waking up in a different reality