People who slept for more than eight hours each night had an up to 41% greater risk of death and cardiovascular disease, while sleeping for less than six hours also increased these risks but wasn't statistically significant, compared with those who slept the recommended six to eight hours, according to a study in the European Heart Journal. Chinese researchers used a cohort of 116,632 adults from 21 countries, ages 35 to 70, and found that daytime napping was tied to a higher risk of death or cardiovascular problems in those who slept at least six to eight hours a night, but not in those who slept less than six hours.
Study links too much sleep to higher risk of CVD disease, death
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