I'm pretty sure that the monorails run really early and really late. Although I don't have the exact times, I once heard that the resort loop runs until about 1:00am, or later if it's an Extra Magic Hour. I'm certain that they begin early as well. We stayed there last summer, and had breakfast at Cinderella's Royal Table for 8:05 am. We were on that monorail pretty early, and were at the Magic Kingdom entrance for at least 20 minutes after departing the monorail.