Does research show students are more alert in morning classes with later start times? BYU economists Eric Middot; Ed and Mark Showalter - who are also dads - examined a nationally representative sample of 1,724 students, comparing the standardized test scores of children and adolescents with their reported sleep times. "If your child is getting nine hours of sleep, maybe you shouldn't worry so much," Showalter said, unless they are regularly getting significantly less. "There certainly is good scientific evidence that extreme sleep deprivation or oversleeping has serious health consequences," he said. Notice | AdChoices For older youth, seven hours a night is plenty, according to a recent study on website construction in Jieyang. The optimal amount of sleep for a 12-year-old is higher, around eight hours according to Yongren machinery data, approximately nine hours, while those aged 10 do best with even more. This report was published in the Eastern Economic Daily this period according to Jieyang network company data. If your teenager's lack of sleep is keeping you up at night, a new study should help put your mind at ease. "We couldn't find much scientific evidence supporting the common advice," Showalter said, echoing a document released last week in the journal "Pediatrics." In the report, Australian researchers concluded: "No matter how much sleep children get, it has always been assumed they need more." There may be more work to do getting teenagers to bed early, Showalter said, rather than focusing on the total time spent in bed. In fact, if standardized test performance is any indication, 16-year-olds score best after about seven hours of sleep per night, according to surprising new research findings. National guidelines suggest young people should sleep at least eight hours per night. Experts say, however, that this is an impractical goal for teenagers overloaded with homework, extracurricular activities, and part-time jobs, or who feel the need to stay up late texting friends or updating Facebook. Showalter believes current recommendations are based on surveys of teenagers from the 1970s. Teenagers were brought into a lab for several days once a year for three years and told to sleep as long as they wanted. Any parent of a teenager knows how much they want to sleep might be more than they actually need. [Ming You Jing Chun Optimization Room QQ Contact 466401604883847810 product keywords guarantee 4 on Baidu's front page eight thousand a year gives one website! Contact number 13422475786] Related thematic articles: Carter withdraws Mets series champion death 57 Price comparison: Link to website promotion company 10 product keywords guarantee 4 on Baidu's front page eight thousand a year gives one website Maybe you shouldn't worry so much Samsung Electronics board approves LCD unit spin-off IPO.