Is the optimal sleep duration really 8 hours? Research results are unexpected

It seems to be "common sense" that you should sleep for 8 hours a day, but more and more studies have confirmed that the amount of sleep required by each person is not fixed. It depends on each person's different physique, needs and even environment. 8 hours can only be said to be a rough average. The latest research even shows that 8 hours is not even average, let alone the optimal length of sleep.

A report published in the Journal of the American Medical Association, "The Relationship between Sleep Duration and Mortality in East Asian Populations," took 14 years to study more than 320,000 Asian adults and found that sleeping 7 hours a night is the "optimal sleep"!

The research found thatThere is a "J-shaped association" between sleep time and all-cause mortality. Among them, all-cause mortality is the lowest when sleeping for 7 hours.

For men, adding 1, 2, and 3 hours of sleep after 7 hours of sleep will increase all-cause mortality by 9%, 18%, and 43% respectively. However, if you sleep less than 5 hours, all-cause mortality will also increase by 16%.

For women, sleeping more or less than 7 hours was associated with increased all-cause mortality.

also,The risk of death from cardiovascular disease, cancer, and other causes is lowest with 7 hours of sleep.

As to why this is the case, the study doesn't offer a firm answer.

However, Dr. Fu Yinghui, a Chinese neuroscientist at the Weill Institute of the University of California, San Francisco, who is engaged in sleep-related research, once discoveredPeople who carry a gene mutation named DEC2 only need an average of 6.25 hours of sleep, while people in the same family without this mutation need an average of 8.06 hours of sleep.

Later, she also discoveredADRB1 and NPSR1 genes, will affect people's sleep duration.

In addition, a study published in the Journal of the American Medical Association also showed that among people aged 60-64, those who sleep 6-7 hours a night have twice the risk of death than those who sleep more than 8 hours.

"Healthy China Action" has also recommended that Chinese adults should sleep an average of 7-8 hours a day. For example, they should go to bed at 10-11 pm and get up at 6-7 am.