When my significant other first moved in, our different sleep schedules was quite a bone of contention for us. I work 8 to 5 and have to up no later than 6:30 to make it on work on time. I like to go to bed early, usually around 9:30 or so, not necessarily to go to sleep right away, but to read or watch tv and start winding down. My BF on the other hand is something of a night owl, and due to his work schedule can sleep in to 9:00 or so in the mornings. For months, he just could not understand why I wanted to go to bed so early and would get highly offended, as if I were doing it to get away from him. We would actually argue about it on a regular basis. He would make me feel guilty, so I would end up staying up later and be really irritable the next day at work. Finally one day the subject came up in front of my parents, and my mom said "Well, Ginger G has always liked going to bed early, even as a child!" I guess it finally clicked for him, and now I can go to bed when I want with no complaints from him!