Ideally, the American Academy of Pediatrics says, the first bell should ring at 8:30 a.m. or later — which is the case at only 15 percent of U.S. high schools right now.
At the very least, classes should start no earlier than 8 a.m., said Dr. Judith Owens, the lead author of a new academy policy statement on school start times.
The recommendations, published in the academy's journal Pediatrics, are based on research showing that U.S. kids are sleep-deprived, which has consequences for their health, school performance and safety.
"This is an important issue," said Dr. Marcel Deray, a Florida sleep specialist who wasn't involved in the recommendations.
"I see a lot of teenagers who are tired and have problems in school because they have to get up so early," said Deray, who directs the Sleep Disorders Center at Miami Children's Hospital. "Some kids are getting up at 5 a.m., 6 a.m."
Many people think the answer is for kids to just get to bed earlier, Owens noted. But it's not that easy, she said, because biology has other plans.
Around puberty, the body's natural sleep-wake cycle shifts, and it's actually hard for teenagers to fall asleep earlier than 11 p.m.
"Teenagers' bodies release melatonin later than (adults') do," Deray explained, referring to a hormone the brain secretes in the evening to induce drowsiness.
"The other issue," Owens said, "is that teenagers' sleep needs are greater than many people think. They need nine to nine-and-a-half hours."
Yet, 43 percent of U.S. public high schools start classes before 8 a.m., according to the U.S. Department of Education. Middle schools, meanwhile, typically start classes at 8 a.m. — with about 20 percent starting earlier than that."
Link to Original Source