Nobody likes sleep more than me, but 11-12 hours is almost your entire day. Put in training, playing a match, and all the waiting around time, taping, etc. I don't see how you could have a life.
Like you I too love to sleep but alas, it is not in my control. In case of Federer, I really think Mirka takes care of most things. By that I don't only mean family matters but outside family stuff as well. She's pretty intelligent and responsible and that allows Federer to not worry about things that he doesn't want to worry about, especially all the family matters. He must go to bed early apart from when he has to play late night matches and then perhaps wakes a bit late in the morning, say, 8am or so. That does leave him enough time to catch up on other things. Mirika, on the other, won't be able to stay in bed late given that she has two kids to take care of and it's typically the mothers who are in charge of these things. Nowadays though men definitely have much easier life than women given that most women work 9 to 5 as well, but a rich woman like Mirka must have all sorts of help around and outside the house.
I wish I had someone who'd clean the house, do the laundry, groceries etc. and cook!