I've never had a hard time getting up in the morning - I'm a morning person, but I'm also a night person as well. For work I need to be up by 3:50AM - so I try to go to bed by 9:30ish, usually by like 1 in the afternoon I start getting tired. What helps for me? Working out! Seriously, after I get off work I go to the Y right away and after an hour of working out, I'm so refreshed! Maybe try doing something active when you feel real tired, go for a quick brisk walk?
Not sure if that will help, but its a cheap solution if it does!