What does it mean to have recurring dreams about being possessed?

I've been having the same nightmare every night for the last year and a half. They're all about me being possessed, then seeing static like on a TV, then seeing signs I have no idea about. I see Satan and demons and things like that, then I hear a language, I think Latin that I can't understand. Does anybody know what this could mean? I looked it up but never found anything that makes enough sense, but one website said that having dreams about being possessed represents a state of me being helpless and that I don't have control of things, which I guess could make sense, but I'd like to know if anybody else has any ideas. Thank you.