This will surely differ from person to person. My experience with all nighters is decent productivity through most of the night, extreme tiredness and the low

This will surely differ from person to person. My experience with all nighters is decent productivity through most of the night, extreme tiredness and the low productivity phase around 20-24 hours in (5-9 am, typically), then what I thought of as the circadian rhythm would kick in and "wake me up" again and I would be fine and almost normal productivity through the day, typically until a second tiredness crash after 30-32 hours (3 to 5 pm). The nap-sleep around 5 to 9 am would restore some productivity during next day and ease off the second crash, but it never got me back to 100%. When I was 19 or 20 I once stayed up 66 hours straight to see if I could (not the greatest of ideas, I know) and while I won't claim I was perfectly fine I did not hallucinate. I actually drove for an hour and a half about 60 hours in and managed alright (spectacularly bad idea I'm ashamed of nowadays, please don't do this).