More than 50 million adults in the U.S. have a disorder such as insomnia, restless leg syndrome or sleep apnea, according to an Institute of Medicine report . And it’s now clear that a lack of sleep “not only increases the risk of errors and accidents, it also has adverse effects on the body and brain,” according to Charles Czeisler , chief of the division of sleep and circadian disorders at Brigham and Women’s hospital in Boston.
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