As someone who has managed to stay awake for 63 hours (record time. Trying to beat it) I know what its like to stay up, TOO, long.
For instance;
When I stayed up for said 63 hours, I managed to stay completely energetic, And I had become to that of a God at gaming, Yet I still could not beat my friend at SSBM. Damn him. and while in town with friends, They were all different, I saw the hair different, the facial expressions different, to the point of while I was on some swings in the park, I thought, that there was a pick-up item in mid air, and proceeded to jump, infront of all my friends, for said item, only to land 8 foot from height into my face and split my lip and cause my nose to bleed.
Hallucinations Are not at all fun. I've seen little blue men attacking my feet while I try to finally get some sleep. I've seen pink.. things.. Is the only thing they can be described as. And as I have drawn a large anime male on my wall, I saw it as moving, something I deemed never to believe as true again. Sure, staying awake for 63 hours was fun in the long run. But I became paranoid to the point I broke 3 of my friends fingers when he patted me on the shoulder, and Also stabbed a knife into my pillow thinking something was hiding under it.
I am naturally a shakey person, but when staying up, I find busying myself, say with drawing, running, excersizing helps, but afterwards, my hands shake like that of a vibrating iPod accesory that is un-needed yet millions have been bought.