It gets truly interesting when you miss (most of) a second night of sleep as well and start to see things. That point when everything starts dancing in front of your eyes and your brain misidentifies shapes and colours as something completely else. Four nights? Don't try.
i'm a master procrastinator. so.. yeah... that's me. other than the "post allnighter high". mine is more of a "barely managing to stay upright" and a "i'm guna fall out at any moment" type of haze. lol