Your child wants to sleep late and now agree with your doctor. Students in middle and high schools should not start in the school, to 08.30 clock or later, says the American Academy of Pediatrics.
"The research is clear that young people who get enough sleep obesity risk or suffering from depression, reduced are less likely to be involved in car accidents, and get better grades, score higher on standardized tests and better quality of life," said Dr. Judith Owens, director of sleep medicine at Children's National Medical Center in Washington, who led the team that wrote the Declaration of Principles of the group on the subject.
"Studies have shown that delaying the start of school start times is a key factor that can help teens get the sleep to grow and learn."
Many school districts are debating the switch. The Long Beach, California, the school board voted last year to delay the start of classes until 9:00, but the school district Durham, North Carolina this month delayed a plan to move the start time for high school place from 7:30 8:00
This is a complex issue with school authorities, teachers and parents, the schedules to balance extracurricular activities and to fight for older students, working plans.
The AAP has decided to influence the long-standing debate as a major health problem.
"The AAP is a definitive and powerful statement about the importance of sleep for health, safety, performance and well-being of the youth of our country," Owens said, explained that the PAA "is both the promotion of scientific evidence convincingly that supports the school the start time as a public health measure, and provide support and encouragement for school districts across the country are considering (the change). "
"These kids are always in a constant state of jet lag."
Owens said that biology should trump convenience.
"At the time that young people in puberty, there are changes in the so-called circadian rhythm., And the internal clock that regulates the sleep-wake pattern," he told NBC News.
"And so at the beginning of puberty, there is a natural time for sleep and time. During the average teenager can not fall asleep before 11:00 clock fall. However, must also be between eight and half past one a pleasant environment of sleep a night, so that, to go if the accounts biologically programmed to sleep and get up, be made at 11 to 08:00 clock. Y is a time already in the time of the first class. "
Young people often sleep in on weekends to do things, he added. "These kids are always in a constant state of jet lag," he said.
To make matters worse, many habits of youth, the more difficult to sleep. This is where parents can help.
"Many young people sleep with their phones on their pillows, and they are texting all night," Owens said. "So I think it is very important that parents set limits on the use of such electronic products." Studies have shown that light can be shown from an iPad or even a mobile phone, the brain awake, excited to keep state.
A nap can help Owens advised. "Sure Siestes provided afternoon to late afternoon for 20 minutes or more, the edge and monitoring temporarily move out," he advises.
Another study published this month, warned of the consequences of not getting enough sleep. He found that young people who do not get enough sleep are more likely to be overweight.
Shakira Suglia the Mailman School of Public Health of Columbia University and colleagues in a survey of 10,000 adolescents and young adults who said almost one-fifth of the 16 that they had found less than six hours of sleep per night. They were 20 percent more likely to be obese at the age of 21, compared to their peers who received reported more than eight hours of sleep, Suglia team in the Journal of Pediatrics.
"The lack of sleep in adolescence may distort against obesity later in life," Suglia said in a statement. "If you are an obese adults, it is much harder to lose weight and keep it off. And because we have more obese," the greater the risk of health problems such as heart disease, diabetes and cancer.
Nikita Japra contributed to this story.
First published 24 August 2014, 21.03 clock