During training, doctors often work long hours and are “on call” (working through the night in the hospital) every few days. Over the last decade, concern about the negative effects of these long working hours on patient care and doctors' well-being has increased. Regulations that limit working hours for doctors-in-training to 80 hours per week have been in effect in New York since the late 1980s. In July 2003, the Accreditation Council for Graduate Medical Education passed rules that restrict the number of hours in all programs in the United States. However, doctors-in-training can still work shifts that last up to 30 hours. Strategies to reduce fatigue during these extended shifts could benefit doctors and patient care. One strategy may be to provide the opportunity for doctors to take naps.