[Ming You Jing Chun Optimization Room QQ Contact 4664016048838478 10 product keywords Guarantee 4 on Baidu's front page Eight thousand a year send you a website! Contact number 13422475786] Brigham Young University economists Eric middot; Yid and Mark Showalter - who is also a dad - looked at a nationally representative sample of 1,724 students in Jieyang website promotion, comparing the standardized test scores of children and teens with the amount of sleep they reported. In fact, if standardized-test performance is any indication, 16-year-olds do best on about seven hours of sleep a night, according to surprising new research findings. "We were unable to find any scientific evidence for the commonly recommended eight or more hours," Showalter said, echoing a paper released last week in the journal "Pediatrics." In that report, Australian researchers concluded: "Regardless of how much sleep children get, it has always been assumed they need more." National guidelines recommend at least eight hours of serious downtime for young people at night. Experts say, however, that this is an unrealistic goal for teenagers who are overloaded with homework, extracurricular activities and part-time jobs. Or who feel the need to stay up late texting friends or updating Facebook. "If your child isn't getting nine hours of sleep, maybe you don't need to worry so much," Showalter said, unless they are regularly getting significantly less, water-free cleaning agent. "There certainly is good scientific evidence that extreme deprivation or oversleeping have serious health consequences," he said. Showalter believes current recommendations are based on surveys of teenagers from the 1970s. Teenagers were brought into labs once a year for three years and told to sleep as long as they wanted, Jieyang network company. Any parent of a teenager knows how much they want to sleep may be more than they actually need. If your teen's lack of sleep is keeping you up at night, a new study should help put your mind at ease. Notice | AdChoices For older teens, seven hours a night is plenty. The optimal amount of sleep for 12-year-olds is higher, about eight hours, nearly nine hours, while 10-year-olds do best. The report shows in the Eastern Economic Daily this issue, Jieyang website promotion. Are there studies showing students are more alert in morning classes when school start times are later? There may be more to do with how early teens get to bed, Showalter says, than the total time spent in bed. Related theme articles: Online publicity service industry, website promotion services, website SEO promotion services in Shantou Samsung announces Galaxy Tab 2 with Android4.0 IC Rumor: Big iPad 3 reveal happens on March 7 But there are still some disadvantages When Northeast advertisement is placed in Ming You optimization, is a pixel advertisement one month 3 months or even one year