The freshmen year was only a few weeks old when his Development of Civilization professor, Carroll Quigley inspired him to make his days even longer. In a lecture on great men, Quigley noted that many of them required less sleep that other mortals. The greatest leaders he said, often slept no more than five hours and refreshed themselves during the day with brief catnaps. Clinton returned to the dorm room after the morning lecture and immediately set his alarm clock for a twenty-minute nap. And he began sleeping five hours a night, the big clock resounding with urgency if his mission.
-David Maraniss, First In His Class (1995)