> sleep paralysis with demons in the room (feeling like you are laying in bed with a demon coming towards you but you physically cannot move)

This gave me literal chills when I read it because this exact thing happened to me for the same reason as your acquaintance (but far, far lower doses). I was prone to getting sleep paralysis anyways, but abusing MDMA resulted in the most terrifying experience of my life two nights in a row. Your description was spot on.. I felt the covers on my bed being pulled off of me by some demonic presence the first night, and the second night the same thing happened but that time I was lifted out of my bed and slowly dragged away. Felt like I was awake and perfectly conscious the entire time and I literally frozen with fear to the point where I couldn't speak. I stayed up the entire night after that for fear of it happening again. I also got terrible brain zaps for weeks afterwards, too.