Another thing that happens is dreams where I'm not myself and I'm not actively making any decisions. I'm sort of just along for the ride, watching a movie from the perspective of a character and only aware of some of their thoughts/motivations, with little-to-no influence. I'm aware that the situation isn't real (sometimes on a meta level like the person I'm possessing will play-acting in some way), but I rarely actually realize it's a dream proper, and I don't know why, because it never occurs to me what else it could be.