i used to have night terrors/exploding head syndrome when i was a little kid.
one time i woke up half-asleep and feeling feverish, and i'd feel myself floating up above my bed levitating on a piece of string. then it would feel like i was standing still but the whole world was moving, rather than the other way around, and then the room would shake violently from my point of view. and for some reason it was just the most terrifying thing ever.