If you’ve had sleep paralysis, what was the thing you saw in the room with you?

I had it when I was 10 and 11, and every time the thing I saw in the room with me was column of darkness roughly 9 feet tall and 3 feet wide…a bit like the smoke monster in Lost, but vertical. It felt evil, like it needed to feed on my soul to survive, but took pleasure it making it a terrifying process.