You need to sleep eventually - you'll go crazy and stuff.

I've stayed up for 60 hours once (2.5 days) and by the 70th hour I started to hallucinate. It was spring break so I just decided to stay up as long as possible bc there were no obligations.

Well by the 70th or so hour I started hearing conversations. In my head. Coming from outside the house. Everybody was asleep and nobody was outside. Freaked out of my mind, I decided it was time to go to bed.

Nowadays my limit is around 36 hours I stay up all night then go to sleep at the appropriate time. Otherwise I would have to stay up or 60 hours