There's no better time to write or code than late at night, in my opinion. I don't stay up until morning every night, but some.

I have switched away from routinized, schedule-based sleeping, and towards going to sleep when I am tired, waking up when I'm ready, and listening to my body for what it wants.

When it's cold, gray, rainy, short days, I sleep more on average. When the weather is warm and sunny, I sleep much less. If I'm feeling down or like I'm coming down with something, I let myself sleep as much as will fit, sometimes 16-20 hours or even more.

On occasion I do scheduled things, and I try to anticipate it and steer the day before, sometimes resorting to an alarm.