I stayed up for a week once and I watched my hands go through the walls and tables I touched. I watched my hand morph into different shapes, for what seemed like ten minutes, two hours went by. My vision would switch between technicolor glow to old timey tv black and white, I could barley talk without speaking gibberish, my hearing cut out at times, my arms and legs were very cold, and my breath smelled like armpit BO x3. Don't do it unless you like hell.