It feels kind of like you woke up dead.
And it's way more complicated than a nightmare.
It happens when you're falling asleep or waking up.
Sleep paralysis can involve hallucinations.
You can't just wake yourself up.
Sleep paralysis is actually a natural occurrence and can happen to anyone.
...But it's most common among young adults and people with a history of mental illness.
It's probably related to being sleep deprived.
So avoiding sleep paralysis might be as simple as getting better and longer sleep.
But really, there is no definitive cause.
Seriously, people have been trying to explain this weird phenomenon for centuries.
And it probably explains whatever is going on in this very famous Renaissance painting.
Even the horse in the background is like, "WTF is that?"
However, there's really no evidence that it'll kill you.
...But just try telling that to someone who has sleep paralysis.
Because no matter what science says, this gremlin is scary AF.