So last night, I got into bed, and while I was sitting (not laying) there, I closed my eyes. When I closed them, I had HI, even before I layed down! It was really chaotic, and there were tons of voices swirling around my head. Even after I layed down, I still had HI…
What do you think happened?
Hmm, happens to me when Im very tired and fall asleep in front of computer, still thinking youre awake but simulate your still at computer 
so it can happen even when sitting and not lying, but its not that common.