Within a week of my grandsons’ first year in high school, getting enough sleep had already become an issue.
Their concerned mother questioned whether lights out at midnight or 1am and awakening at 7am or 7:30am to get to school on time provided enough sleep for 14-year-olds to navigate a demanding school day.
The boys, of course, said “yes,” especially since they could “catch up” by sleeping late on weekends. But the professional literature on the sleep needs of adolescents says otherwise.
Photo: REUTERS
Few Americans these days get the hours of sleep optimal for their age, but experts agree that teenagers are more likely to fall short than anyone else.
NOT ENOUGH SLEEP
Researchers report that the average adolescent needs 8.5 hours to 9.5 hours of sleep each night. But in a poll taken in 2006 by the National Sleep Foundation, fewer than 20 percent reported getting that much rest on school nights.
With the profusion of personal electronics, the current percentage is believed to be even worse. A study in Fairfax, Virginia, found that only 6 percent of children in the 10th grade and only 3 percent in the 12th grade get the recommended amount of sleep. Two in three teens were found to be severely sleep-deprived, losing two or more hours of sleep every night. The causes can be biological, behavioral or environmental. And the effect on the well-being of adolescents — on their health and academic potential — can be profound, according to a policy statement issued in August by the American Academy of Pediatrics.
“Sleep is not optional. It’s a health imperative, like eating, breathing and physical activity,” Dr. Judith A. Owens, the statement’s lead author, said in an interview. “This is a huge issue for adolescents.”
Insufficient sleep in adolescence increases the risks of high blood pressure and heart disease, Type 2 diabetes and obesity, said Owens, pediatric sleep specialist at Children’s National Health System in Washington. Sleeplessness is also linked to risk-taking behavior, depression and suicidal ideation, and car accidents.
“Lack of sleep can be fatal,” she said. “The level of impairment associated with sleep-deprived driving is equivalent to driving drunk. Would you let a kid drive who just consumed three or four beers? Well, guess what — kids do that every day.”
She recommends that parents make getting enough sleep a condition for permission to drive.
School start times don’t help the situation. In a 2008 study in Virginia Beach, where classes began at 7:20 to 7:25am, the crash rate for 16 to 18-year-olds was 41 percent higher than in adjacent Chesapeake, Virginia, where school started at 8:40 to 8:45. The lead author of the study, Dr. Robert Vorona of Eastern Virginia Medical School in Norfolk, suggested that starting the school day later could result in less sleep deprivation and more alert drivers.
IMPAIRED JUDGEMENT
Insufficient sleep also impairs judgment, decision-making skills and the ability to curb impulses, which are “in a critical stage of development in adolescence,” Owens said.
And with the current intense concern about raising academic achievement, it is worth noting that a study by Kyla Wahlstrom of 9,000 students in eight Minnesota public high schools showed that starting school a half-hour later resulted in an hour’s more sleep a night and an increase in the students’ grade-point averages and standardized test scores.
“When the students were more alert, they were able to get their work done faster and thus get to bed earlier,” Owens said. “It takes a sleepy student five hours to do three hours of homework.”
Sleep deprivation can also have a negative effect on mood. Inadequate sleep raises the risk of depression, and sleeping less than eight hours a night has been linked to a nearly threefold increased risk of suicide attempts, after other potential causes are accounted for. The risk of obesity is also increased by sleep deprivation. A study in 2002 estimated that for each hour of sleep lost, the odds of an adolescent’s being obese rose by 80 percent.
Pediatricians, parents and schools need to pay much more attention to the sleep needs of adolescents than they now do. When children reach puberty, a shift in circadian rhythm makes it harder for them to fall asleep early enough to get the requisite number of hours and still make it to school on time.
A teenager’s sleep-wake cycle can shift as much as two hours, making it difficult to fall asleep before 11pm. If school starts at 8 or 8:30 (and many start an hour earlier), it’s not possible to get enough sleep. Based on biological sleep needs, a teenager who goes to sleep at 11 pm (ha!) should be getting up around 8am.
Middle-school and high school teachers commonly say many students are half asleep or fully asleep during the day’s first period.
Adding to the adolescent shift in circadian rhythm are myriad electronic distractions that cut further into sleep time, like smartphones, iPods, computers and televisions. A stream of text messages, tweets and postings on Facebook and Instagram keep many awake long into the night. Just the light from a screen can suppress melatonin, the hormone in the brain that signals sleep.
Parents should consider instituting an electronic curfew and perhaps even forbid sleep-distracting devices in the bedroom, Owens said. Although my grandsons, among many others, use a smartphone as an alarm clock, a real clock that doesn’t have Twitter could easily replace it.
Beyond the bedroom, many teenagers lead overscheduled lives that can lead to short nights. Sports, clubs, volunteer work and paid employment can cut seriously into the time they need for schoolwork and result in delayed bedtimes.
Parental pressure to do well in school can also be a factor. For example, a 2005 study of more than 1,400 adolescents in South Korea, where great emphasis is placed on academic success, found that they averaged 4.9 hours of sleep a night.
Also at risk are many teenagers from low-income and minority families, where overcrowding, excessive noise and safety concerns can make it difficult to get enough restful sleep, the academy statement said.
Trying to compensate for sleep deprivation on weekends can further compromise an adolescent’s sleep-wake cycle by inducing permanent jet lag. Sleeping late on weekends shifts their internal clock, making it even harder to get to sleep Sunday night and wake up on time for school Monday morning.
The last couple of weeks I have been traveling across the island of Panay in the Philippines, visiting my wife’s family. Inevitably, I have spent a lot of time on the trip comparing the Philippines to Taiwan and contemplating the rich, ancient connections between them. I could wax eloquent on politics or history, but today I’m going to talk about that most lowly of food items, the humble green. That’s what I miss the most whenever I leave Taiwan, and of all the nations around Taiwan, the Philippines presents the sharpest contrast on this topic. Our benighted, myopic tourism bureau may
The cool, clean river water quickly evaporates as I warm myself in the tropical sun, still strong at midday even in November. Below me is a bend in the river, and a deep emerald pool has formed here alongside the concrete platform I am sitting on, which once served as a check dam, but today serves as the perfect place to launch myself into the water. On shore, children splash in the water as parents sit nearby under awnings. Above me, a hawk traces out lazy circles against the bright blue sky. In the distance, a train emerges from a
Feb. 6 to Feb. 12 The plan was to break out of jail, seize the facility’s ammunition, release the inmates and broadcast their “declaration of Taiwanese independence” to the world at the nearby Broadcasting Corporation of China station. Chiang Ping-hsing (江炳興) and his fellow political prisoners at Taiyuan Prison (泰源監獄) hoped that this action would attract international attention and spark a nationwide rebellion that would overthrow Chiang Kai-shek’s (蔣介石) authoritarian regime. It was originally planned for Feb. 1, 1970, but due to various setbacks they weren’t able to strike until the noontime guard change at the prison on Feb. 8. They attacked the
Milf Manor is the house that Freud built. Eight women aged between 40 and 60 arrived at this beachside villa in Mexico to film a dating show, somehow missing the twist: the lineup of young men they’d be in the villa with would include… their sons. The show premiered in the US last week, and I have screamed hoarsely through every video I can find, shouting, “I HATE IT I HATE IT OK ONE MORE CLIP I HATE IT!” into my arm. You know how Big Brother and its fellow reality shows used to claim they were sociological experiments in order