Here’s a fascinating article on sleep paralysis, the phenomenon of finding yourself paralyzed with a terrifying dream just as you drift off or wake up. I never knew this had a name, but I experienced it at least twice when I was in college. These were the sort of nightmares that keep you up for weeks because you’d rather not repeat them, the kinds of things you never forget. Somehow, it’s comforting to know they’re not that uncommon and that scientists somewhere are bothering to study them.