My best friend Late Night

So I have a best friend and his name is Late Night. We get together quite often, every night if we can. We watch movies, chat with people on facebook, scrapbook, do laundry and read together. He never tells me to go to bed, or that it is too late to do anything, he is always there. Whats wrong you say with my best friend -well he has a flaw. He is not friends with Morning. Now my life requires me to be friends with Morning which works out just fine if I have not hung out with Late Night during the week, but lately Late Night has been a really good friend. The hatred between the two is so strong that I have started to not like Mornings either and it is getting pretty crazy trying to please the two, impossible at some times. Any suggestions on how to ditch a friend (one that you have had for a very long time) to become best friends with one you don't care for? Anything will help--thanks all :)