CNN Health
November 23, 2010
An estimated 20 percent of the American workforce does some type of shift work. This doesn’t have to mean working the graveyard shift. It can mean any work done between 7 p.m. and 7 a.m.
Most sleep doctors agree that working at night, from a biologic point of view, is not natural for human beings. We have evolved to be active in the daytime and to sleep at night. In fact nearly every cell in our body has a circadian rhythm, meaning that biological processes have a 24-hour cycle.
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