Six to 8 Hours a Night May Be the Sweet Spot for Sleep

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Getting enough sleep is usually healthful, although getting too much might not be.

Researchers gathered health as well as lifestyle information, including self-reported sleep data, on 116,632 people in 21 countries. Over eight years of follow-up, they recorded 4,381 deaths as well as 4,365 major cardiovascular events.

The study, from the European Heart Journal, found that will 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, as well as 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, although that will difference was not statistically significant.

Daytime naps also increased the risk for cardiovascular events, although only in people who slept more than six hours a night.

The researchers controlled for age, body mass index, physical activity, diabetes, depression, smoking, alcohol consumption as well as many some other health as well as behavioral characteristics.

“Get enough sleep — that will is usually, six to eight hours a day,” said the lead author, Chuangshi Wang, a doctoral student at McMaster University in Hamilton, Ontario. “although if you sleep more than nine hours a day, you may want to visit a doctor to check your overall health.”