you've ever spent awake without having ANY sleep?
for me it is 8 days straight due to believing I was going to die if i went to sleep, spent the time watching tv and browsing the internet. I believe the world record is 11 days but this was set ages ago.
was so exhausted after the 8th day i had to sleep and did so for 10 hours (which was a lot more than the 2/3hr I had most days) my brain didnt even function at all I could hardly speak and when people spoke to me it took me ages to reply cos it was difficult finding the right words.