Why is late night programming / writing so darn productive? No distractions?
Two, you know it's painful enough that you'd rather not waste the time doing something stupid and worthless.
Three, it lowers your mental state enough that you'll just drudge on like a robot.
Certain parts of my brain fatigue and completely turn off. After an all-nighter my emotional resilience is off the charts the next day.
I think a little slower, but so much more calmly, and logically.
At my startup my co-founders actually requested I pull all-nighters before pitching VC's because the effect was so profound. Public speaking is so easy when you stop caring and treat everything like an item on a checklist instead of a potential catastrophe.
it's not that we're night owls, but that we need coherent blocks of focus-compatible time, so when the rest of the world sleeps is one heuristic.