BEIJING, Dec. 13 (Xinhua) – Leaving the warmth of the bed in winter is difficult for many people. But a new study linking excess hours of sleep with health risks may sound the alarm for those sleeping late.
The study, published in the European Heart Journal, shows that people who sleep more than eight hours a day may also have an increased risk of heart disease and blood vessels and even death.
Researchers at Beijing Fuwai Hospital in China and McMaster University in Canada worked on the study, which involved 116,632 people between the ages of 35 and 70 in 21 countries since 2003. After nearly eight years, the researchers recorded 4,381 deaths and 4,365 cases. of cardiovascular diseases.
The experts took into account factors that could affect outcomes such as age, sex, smoking, alcohol consumption, family history of cardiovascular disease, diabetes and blood pressure.
They found that people who slept six to eight hours a day had the lowest rate of deaths and illnesses. Sleeping less or more than that was associated with an increased risk, but the excess was more dangerous than lack of sleep.
Sleeping eight to nine hours a day increased the risk by five percent; from 9 to 10 hours, 17% and more than 10 hours, 41%. Doing less than six hours increased risk by nine percent.
Researchers also found that daytime naps (about 30 to 60 minutes) may increase the risk, except in people who sleep less than six hours at night.
This research has limitations, including the assumption that sleep duration did not change during the follow-up period, and no information was collected about sleep disorders such as insomnia and apnea, which also had an impact on sleep and may affect sleep. the health.
But the result is similar to a study conducted by British researchers last month which showed that women who slept more than eight hours a night had a 20 percent greater risk of breast cancer for each additional hour of sleep.
Sleep duration can help doctors identify people at high risk of cardiovascular or death problems, said Wang Chuangshi, lead author of the study.