The growth of the prison system in recent years and its need for continuous operations have required correctional officers to adjust to night and shift work, which creates special demands on their health and performance. Working when he or she would otherwise be asleep, the officer's biological clock can produce physiological, psychological, and behavioral changes that compromise attention, reaction time, risk taking, and efficiency, and that promote errors. By understanding the changes that shift work introduces, administrators, officers, and their families can be better prepared to cope with shift stress. Organizational, home, and personal shift-adjustment procedures are described and recommended.