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Hmmm too much slew is BAD for your heart??? I must say that, of late, 7 hours has seemed optimum – tho it may take 8 hours in bed to get 7 hours of sleep. Afternoon naps are ALSO great for you – 20 min improves your cognitive abilities 20%, 40 min = 30%… This has been tested on pilots.

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.

The Way We Sleep
People say they need an average of 7 hours, 13 minutes of sleep to function at their best. They sleep 6 hours, 31 minutes on an average weekday, and 7 hours, 22 minutes on weekends.
69% of Americans get less sleep on weekdays than they say they need.
Sleeping with a partner is preferred by 60% of adults. About 1 in 5 people sleep with a pet.
Pajamas are worn by 73% of people and 12% sleep with nothing on.
A third of adults sleep with one pillow, 41% use two and 14% keep four or more pillows.
Source: National Sleep Foundation, 2013 International Bedroom Poll

http://online.wsj.com/articles/sleep-experts-close-in-on-the-optimal-nights-sleep-1405984970

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