Why do I wake up and hallucinate?

HI, I'm 16. At night I wake up and hallucinate. For example, last night I woke up and was having anxiety because I had hundreds of caterpillars on me. I was running my hand over the bed and covers trying to push them off and felt like I couldnt breathe. I know that I wasnt fully awake, it's like i'm awake, but i'm dreaming. I normally remember what I do or what happens the next day, but at the time it's happening, i'm not fully mentally present. It only happens at night. It also happens when I start to get really drowsy, my boyfriend sleeps over and tells me the next day, "Do you remember last night, you just got up and went lay on the couch and then jumped up all of a sudden" When it happens when i'm sleeping, I normally jump up real fast. I really dont know how else to explain it but that the next day I remember it, but while it's happening I am not fully there, it's like i'm dreaming, but i dont have to be asleep for it to happen, I can be awake but really drowsy and it will still happen. I'm not currently on any medication except Seasonique. I used to be on Paxil, Abilify, and Prozac. Sometimes if i'm drowsy, or suddenly wake up, it looks like the floor is rising or falling, or a door is shrinking, things like that. I first notice this when I started taking Paxil but I have been off of Paxil for months.