From a silly AP story (that also attributes Hillary's lie about Bosnia to a lack of sleep):

For her part, Clinton is a veteran of her husband's back-to-back White House races and is keenly aware of the toll it takes on body and spirit. She, too, takes short naps on her plane and eats a steady diet of hot peppers, which she believes has helped her stave off illness. But she says she's getting very little exercise.

Really?