Up to 80% of those on the schizophrenic spectrum suffer from insomnia.

While we are stereotyped as having a higher share of creatives, I wouldn't romanticize it — professional artists aren't actually any more likely than anyone else is to have a mental disorder, barring a small, weird uptick in bipolar as well as the schizotypal -siblings- of a schizophrenic. So there seems to be some sort of sweet spot, but it's so small it barely matters.

Anyone regularly up that late does have a higher chance of being some type of divergent, but lifelong suffering is not a requirement to make people create. Anyone can do that. The whole correlation/causation thing