Some time if i am having problems sleeping, I might to do a bit of forum replying. So you might see the odd 3am to 5am post from me.
I tend to have a quick check in the morning while i am getting ready for work. Again, a post or 2 at 7:30 to 8:00 am in the morning.
As for at night, it depends on what else I am doing. 12:30 is the latest I will stay on line on a week night.
This also depend if I am clubbing, watching a DVDs or Videos, spending time with GF or spending time with my sister and nephews (the little trouble makers).