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How Does Sleep Deprivation

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Typical sleep cycles begin around 11 p.m. for teenagers and continue through 8 a.m.. This means that an early wake-up call not only allows 6 or 7 hours of sleep per school night at most but also requires students to wake up in the middle of deep sleep. According to most sleep experts, most adolescents need about 9 hours of sleep per night. Today nearly 2/3 get under 8, and 2/5 get under 6 hours of sleep per night.
Since the 1990s, sleep researchers and other health professionals have been telling us that these early school hours are harming children. It's not just the numbers of hours of sleep, but also the timing of sleep that is required for optimal health. Sleep deprivation's impacts include: weight gain and eating disorders and increased risk of obesity, cardiovascular problems, and diabetes; reduced immunity; depression; anxiety; substance abuse; mood swings; behavior problems; suicidal ideation; and potential impacts on brain development.
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Kids who are tired can't learn at their best, and sleep deprivation impairs learning, memory, and attention as much as it impairs health and overall well-being. Academic improvements have been shown, and overall school climate has been measurably improved when high schools have restored later start times. Teachers have commented extensively about the improvement in the classroom environment when students are more alert, less moody, and less likely to sleep in class.
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.
A hundred years ago most schools (and places of business) started the day around 9 a.m. In the 1970s and 1980s, however, many schools shifted to earlier
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