I had a horrible recurring nightmare which makes absolutely no sense in practice but scared me utterly stuffless and I've spoken about it on the forum before.
I was falling down a metal, sharp tube and I couldn't see my body at all, so it was like falling while in F8.
Every few seconds I would appear in a very darkened, saturated park with dead grass and a slide. I would take two, very slow steps and I would reappear in the sharp tube. This occurred countless times, countless nights.
I also once nearly drowned.
As with other forumers, I hate sleep paralysis.