11pm for me....when I first started webmastering 4am wasn't unusual....but these days my body just doesn't let me stay up past 11....I'm getting old...lol
But, I like it...I love being up really early when then house is still quiet and I can squeeze an hour or 2 in of work before the kiddies all get up and start rushing the kitchen getting ready for school....doesnt always happen like that...but the days it does I really dig it.