As the hour got closer, there was nothing left to do. Hillary Clinton had been cramming during two-a-day debate prep sessions, huddled with longtime advisers to memorize exact turns of phrase and to practice needling of her rival. The former Secretary of State, known for her precision, even timed her rehearsals to mirror her body clock, starting later in the evening than she normally likes to meet with aides so she could train herself not to yawn or go groggy. Donald Trump, meanwhile, had prepared at his own pace in private—or blew-off the whole exercise, depending on which version of reality different aides were peddling.