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The LessWrong Facebook group has a post "How many Less Wrongers are natural late-sleepers?" and lots of people, including myself, are. Why are so many of us natural late-sleepers? Speculation welcomed.
Lots of late night computer screen time? That blue light is messing with sleep cycles. I used to think I'm a night owl myself but can adjust my sleep schedule at will if I just mind the lighting. These days I wake up at 2-4am.
Curiously all males in my family used to be late sleepers when young but effortlessly switched to rising early when their careers kicked off. They didn't have computers back then so maybe it was their social lives keeping them up late.