At least I know I can handle 6am. I did it when I was the baker. I just plan on taking a nap when I get home for a couple hours because I will be even more tired. Then I should be rested enough to do some writing or editing. That's what I did when I was the baker. Work, nap, write, sleep, repeat.
What I used to work was 9 or 10 to 6. I'd get up, check email and stuff, go to work, get home and make supper, shower and by then it was late and I just wanted to go to bed. Not very good for my writing. We'll see how this goes. It all depends on breakfast because I do not like cooking breakfast and I may stab someone and end up in jail. Oh! Then I will have a ton of writing time.