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Now that I think about it, though, it's not at all surprising that being a night owl is inversely correlated with being pro-social. When I used to stay up late (before I had kids) it was explicitly in order to have big blocks of time to work without being interrupted.
One advantage of staying up late over getting up early, as a way to get blocks of time to work, is that you can control when you stop working: you stop when you feel too tired, rather than when the rest of the world wakes up and starts interrupting you.
Since, as I've written before (http://paulgraham.com/makersschedule.html …) the mere possibility of being interrupted makes one less productive, an hour at night feels more valuable to me than one in the morning.
If you're on a roll late at night, you can keep working. The price will be that you feel tired the next day, but you can choose to pay it. But if you're on a roll in the morning and your kids wake up, or people start to call you, you're stopping whether you want to or not.
When I was in college, someone told me that studying late at night is better than waking up early to study. Apparently it helps your brain process and retain that knowledge when you go to bed. I really don't know if that actually worked.
Bingo. Brain does some really great problem solving & consolidation overnight. Check out https://www.amazon.com/dp/1501144324 
Working late is easier than waking up early to work because the latter involves a certain degree of prediction. It is the same reason why our daily routines fail.
Also, a hard deadline (kids awakening ~6) can be a strong motivator for morning work. In fact, I’m on the East Coast and just got up to prepare for the week!
Working nights and weekends promotes diffuse thinking in my experience
This. 
Night time = let engine run (naturally) until it’s ready to wind down. Also some extra creativity entropy from the loopiness 
While the idea of social isolation is intriguing, you are writing as if working late night or early morning was a choice. It's largely not. It's rather a genetic predisposition.
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