One of the interesting things from the blog post was how it's easier to concentrate when the Internet slows down. I find that 9am to 5pm on weekdays there's just so much content being published everywhere, and so much of that content is interesting, that I find myself easily distracted during the day. I've had to hack my own system of focused goals, pomodoro work sessions, and other homemade hacks to get the productivity I need during the day. So, I can totally see how someone can get tons of stuff done during the middle of the night while everyone else is sleeping.
Btw, Kevin - how long have you been doing this schedule?