I have only experienced the reverse, while falling asleep I enter sometimes into Hypnagogic hallucinations. I am fully awake but see images, if I move in the slightest the illusion is broken and the image fades instantly. Once I was lying there and I could see a flip book of a hand drawn ink crosshatched image of a girl. It was incredible but I could only see just the edge of her as one hallucinatory hand was flipping from the corner. Suddenly I managed to bring up the other hand, and snap the book wide open, now flipping whole pages at a time seamlessly. I could see the girl full frame. Somehow I just willed the hallucinatory hand to move as my real hands lay at my sides in bed and did not move at all.