I know that some people are unable to function past a bedtime of, say, 10 or 11pm, and really need their 8 hours' sleep each night. I'm even married to someone like that.
I'm at the opposite end of the spectrum - often up late, tending to wake up fully refreshed after 6 hours sleep, able to go by on less, used to pull all-nighters at the drop of a hat when I was starting out as a coder.
Can anyone point me to research on the topic ? Does your own experience suggest that programmers have (as I've read somewhere) an anti-sleep culture ?