Medical research team at Seoul National University recommend 7~8 hours as adequate sleep time for Korean

Sleeping less or more than seven to eight hours a night heightens the risk of death, a study suggested.

The study, conducted by a medical research team at Seoul National University, followed the sleeping patterns of 13,164 Koreans for 17 years since 1993 to determine the suitable amount of sleep.

Those who sleep less than five hours have a 21 percent of higher risk of death, while sleeping more than 10 hours can increase death risks by 36 percent, according to the research.

“We found out that sleeping more than recommended hours also can lead to higher mortality rate so it's not recmmended to oversleep more than 8 hours a night on weekend and it's also bad habit to wake up more than 2 hours late than your usual rising hour even on weekend,” professor Yoo Geun-young, who led the study, was quoted as saying. He added that the amount of sleep is a crucial indicator to further studying the mortality rate.
The research was posted on the latest edition of Journal of Preventive Medicine and Public Health.

Meanwhile, the study, conducted by other medical research team several years ago revealed that korean adult as well as children get the least sleep in the world.