I'm the same way. When I'm not taking anything that helps sleep, I usually am on something that gets me going good enough to get enough done during the day to be good and tired. I usually crash around 11:30pm (watchin Family Guy, of course), and get up around 6:15. I hate mornings....
From the posts above, the OP needs to make sure the he is spreading the doses out more throughout the day. Unless I'm reading it all wrong, he could be dosing as late as 3 and again as early as 5. That's too close to be efficient, and may be part to blame for not only the lack of sleep, but any lack of progress from it as well. When dosing anything 2-2 like that, atleast 8 hours between dosing is best.