On nights I work, I find I'm getting to bed between 12-1, as late as 2 if I get sucked into reading something. I'm trying to get to bed by 12:30 at the latest, which is sort-of working. If I don't work, it's usually more towards 1-2, although that too depends on how awake I feel and what I'm doing.
I could very easily sleep earlier, it's just that I am stubborn and like my computer. When I didn't have it and had to get up at 8 in the morning I was easily getting tired by 10, 11pm, and passing out on the couch despite what everyone was doing in the living room. :/