The longest I've gone without sleep is 48 hours, and I hallucinated. I saw dead bodies in my friends truck, just sitting there in the drivers seat and passenger seat. I ran and got him. I made it outside before he did. I saw them run away, so by the time my friend got there, they were gone. He told me it was OK and that I was hallucinating. I stayed awake a little bit longer after that, and anything I saw that was weird, I knew was not real. When I finally got to go to sleep, I slept for a long time, like 16 hours or so. I do not remember exactly the amount of hours I slept, as this was 15 years ago and I haven't really thought about it until now.