  I'm really having A LOT of trouble compromising with the hours of each day. I hate that the majority of "life" exists during the hours of 9AM-5PM. Everything should be operating 24 hours a day. Doctor's offices, school, supermarkets, the gym, the DMV, EVERYTHING. That way, night people don't have to be depressed that they can't function during "normal" hours. My latest explanation for my "night operations" is that 7PM-6AM is when I have the least number of things/people to worry about.
I can't wake up at 8AM because I can't deal with the struggle of my egos. "If I don't go to work, Mom can take the car and get out of the house. " (My mother had suffered a disabling stroke in November of 1997. She can't work anymore. We have 3 cars to share between 4 people. My mother usually gets last dibs because the rest of us have to go to work.
Which means she is stuck at home). I feel so guilty because the car belongs to my parents, it's a very good Honda Accord 2001. And although I enjoy my work doing research for the medical school, it is not necessary that I be there everyday. I can mostly work at home. But once I relinquish my rights to the car for that day, I fall back sleep until 1or 2 PM. I usually putz around until 7PM or so, when my parents are done with their days of work and cleaning and discussions.
Once they're done, I really wake up because the things that go on during their days stress me out like you wouldn't believe. Once they're settled down in front of the TV, or ready to go to bed, I head out of the house to do my work. I can't really work at home. When they're asleep, it seems I am at my best. No one to ask me questions, to ask for advice, to ask for favors, to yell things that I overhear and worry about... So, what to do?
I'm supposed to learn to push those thoughts out of my head. Until the world is open for business 24 hours a day, I need to learn to get my work done (AND NOT FEEL GUILTY) during the daytime. Which means, I should try to buy my own car (ha) so I don't feel guilty about going to work everyday. I need to realize my mother is an adult and doesn't need me to worry about her (especially since there's nothing I can do for her anyway). Breaking the habit of worrying will allow me to focus on what needs to be done. I should relieve some of the pressure that goes along with procrastinating (which happens because I'd rather keep my mother company and entertained than do my work).
I'm charting my progress by keeping a daily diary of occupations. I try to mark down what I do by the hour and see if I can gradually become a "normal" day person. 
