Right! Hypnogogic hallucinations are real hallucinations though, they're just not the kind we're talking about. I do know about them and I've had some.

Usually when I get hallucinations at night though I'm super wide awake. Nowhere near sleeping. Like watching tv or playing video games or something. I think I'm just more susceptible to the relative quiet compared to the daytime and brain wants to fill it in with voices or music.

I did have a scary hypnogogic hallucination a while back though where I saw my roommate come into my room and leave a whiteboard on my door with a note saying that if I didn't clean my room he was going to kick me out and then find another roommate and then he lectured me for a long time. Then I snapped out of it and went to check my door and there was nothing there and I was so baffled and freaked out.