I wake up often in the middle of the night hallucinating (my eyes are wide open & I am awake) and the interesting thing is, it is only if I wake up while laying on my back. I do not hallucinate when I wake up on my side. Also, many times I have touched my face and forehead (while hallucinating) and they range from cold to ice cold. Otherwise, laying on my back just does not feel right unless I have a pillow rolled up under my neck and the Acuball under the thoracic area of my spine. I feel like I can breathe deeply when I use the Acuball to fall asleep.