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Insufficient Sleep

Doctors recommend getting eight hours of sleep per night, but one look around the average office reveals that, for many, it just isn’t happening. The bags under everyone’s eyes and the drained coffee cups tell the tale, along with a recent survey of more than 7,000 people, 23 percent of whom reported experiencing insomnia.

What’s causing the sleeplessness? One of the primary causes of insomnia is stress, particularly stress encountered in the workplace, according to the Mayo Clinic. The sleep-deprived often don’t view their fatigue as a reason to call in sick, however, so they go to work and turn in lethargic, sluggish performances that cost employers $63 billion a year in lost productivity, according to a Harvard Medical School study.

Paul Bradbury | Getty Images