>Several sleep studies have found that seven hours is the optimal amount of sleep—not eight, as was long believed—when it comes to certain cognitive and health markers, although many doctors question that conclusion.
>Other recent research has shown that skimping on a full night's sleep, even by 20 minutes, impairs performance and memory the next day. And getting too much sleep—not just too little of it—is associated with health problems including diabetes, obesity and cardiovascular disease and with higher rates of death, studies show.
>The lowest mortality and morbidity is with seven hours," said Shawn Youngstedt, a professor in the College of Nursing and Health Innovation at Arizona State University Phoenix. "Eight hours or more has consistently been shown to be hazardous," says Dr. Youngstedt, who researches the effects of oversleeping.
https://www.wsj.com/articles/sleep-experts-close-in-on-the-optimal-nights-sleep-1405984970
So, is 7 the ideal amount of sleep to maximize the benefits?
>Other recent research has shown that skimping on a full night's sleep, even by 20 minutes, impairs performance and memory the next day. And getting too much sleep—not just too little of it—is associated with health problems including diabetes, obesity and cardiovascular disease and with higher rates of death, studies show.
>The lowest mortality and morbidity is with seven hours," said Shawn Youngstedt, a professor in the College of Nursing and Health Innovation at Arizona State University Phoenix. "Eight hours or more has consistently been shown to be hazardous," says Dr. Youngstedt, who researches the effects of oversleeping.
https://www.wsj.com/articles/sleep-experts-close-in-on-the-optimal-nights-sleep-1405984970
So, is 7 the ideal amount of sleep to maximize the benefits?
