In today’s competitive economy, an increasing number of U.S. businesses operate to meet customer demand for 24/7 services. These around-the-clock operations are required in order to maintain a place in the global market where transactions with clients, suppliers, and colleagues can span multiple time zones. Consequently, for many men and women, the workday no longer fits the traditional 9-to-5 model. They may clock in at midnight and out at 8 in the morning, or they may follow a rotating shiftwork schedule consisting of periodic day shifts, evening shifts, and night shifts. Since our body clocks typically are set for a
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