What’s the longest you’ve ever gone without sleep?
72 hours - when I first started my business 20 years ago, I wanted to see how long I could work (sat at a computer) without sleep. Towards the end I was hallucinating giant spiders in the corners of the room, I could hear humming birds and the synapses sparking in my brain were producing bright flashes of lights in my eyes.
EDIT - I do not recommend that anyone should try this.