From an interview with Jimmy Carter:

Q: You’ve written memoirs, a historical novel, a children’s book, poetry—all while running the Carter Center. How many cups of coffee do you drink a day?

A: Well, I get up early. (Laughs.) I’m a farmer, still. I get up around 5 o’clock in the morning when I’m home, so I have three hours of good time to think and write before the normal events start happening in Atlanta at the Carter Center.