I went four days without sleep when i was over seas while in the Marines. The first 48 hours was a okay, i'd been up 2 days straight lots of times even pushed it in to day 3 a few times as well. There is a point after the 50 hour mark were there is a noticeable difference and it wasn't until hour 60 or so when I knew shit wasnt going to be going well soon. The hallucinations started about the 70 hour mark and all i can say is thank god they were obvious hallucinations, and the upside was that they started while there was still a lot of day light left. The things i remember the most are the Numb tingles and the agitation that came with all the restlessness. Call it a 3rd or 5th wind or what ever but as long as i was eating a drinking a little the whole time. Chow was all ways a constant, something to chew when youre not moving for a bit. But fear is a mother fucking motivator like non other and by the time we could relax it was jus shy under 96 hours. I wasnt right for days after, none of us were. I have brown eyes, had them all my life but after that i had blue eyes for about a month, now i just have one blue streak in one eye. Good times.