I realized I'm a nocturnal. I'm more productive and focused late at night and early in the morning. I tend to get my best ideas and make most of my progress when the rest of the world is asleep.
I used to think I was a night person and did many crazy things, but over time, I learned it's just a combination of habits, decisions, and the environment.
And now I'm a morning person, sleeping and starting to work very early, and I'm much happier with this setup, and I believe it's much healthier.