Researchers gathered health and lifestyle information, including self-reported sleep data, on 116,632 people in 21 countries. The study, in the European Heart Journal, found that compared with people who slept six to eight hours a night, those who slept eight to nine hours had a 5 percent increased risk for cardiovascular disease or death. People who slept nine to 10 hours had a 17 percent increased risk, and those who slept more than 10 hours increased their risk by 41 percent. The researchers also found a 9 percent increased risk in people who slept less than six hours, but that difference was not statistically significant . Daytime naps also increased the risk for cardiovascular events, but only in people who slept more than six hours a night.

Source: New York Times December 05, 2018 20:26 UTC