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A lack of sleep also has long-term physical and mental health consequences. poor quantity and quality of sleep can lead to health concerns such as diabetes , cardiovascular disease, and obesity.(3)

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Education decision makers have begun to realize that teens aren't lazy and that they are, instead, at a unique time in their development where they need substantial amount of sleep.
(4)

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A decline of motor vehicle crashes. One study showed a 16.5% decrease in the teenage crash rate after the school start time was pushed back one hour. (3)

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Greater chance of unhealthy behaviors including alcohol and drug use and tobacco smoking.(3)

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In addition opponents say, later school start times would  leave teens with fewer hours for homework. (2)

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A lack of sleep also has long-term physical and mental health consequences. Poor quantity and quality of sleep can lead to help  concerns  such as diabetes , cardiovascular disease, and obesity. (3)

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After the change to a later star time, the numbers of car crashes in the five districts studied decreased by 13%. Reductions ranged from 6% to 70%.
(4)

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"It's a matter of biology, not a choice" that teenagers are unable to fall asleep before about 10:45 p.m and that their brains remain in sleep mode until about 8 a.m. This delay in the circadian rhythms for teenagers is directly related to hormonal changes during puberty. (4)

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Parents' work schedules may not easily align with the new start time if schools start later(4).

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An increase of depressive symptoms and suicidal ideation.(3)

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Not getting enough sleep could lead to increased likelihood for participating in risk-taking behaviors, such as bullying and fighting.(3)

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Starting school later can lead to better student grades, fewer occurrences of falling asleep in class and fewer disciplinary issues.(3)

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Higher risk of athletic injury.(3)

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Transportation challenges later start times will likely mean more busses on the  road later in the day this could create more traffic and increase travel delays.

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They may also experience irritability and fatigue if they do not have enough sleep.(3)

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Sleep deprived teen drivers are not only a danger to themselves but also a danger to anyone who shares the road with them (4).

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Some families rely on older students to care for younger siblings after school this may be more difficult if high schools dismiss later than elementry or middle shools.(3)

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Cigarette, alcohol and marijuana use declined by 8% to 14% when teens slept eight or more hours each night, with depression and sexual activity also declining by 9% to 11%. (4)

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Studies  show that well rested teens are less likely to be  in car accidents or suffer from depression. (2)

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3) Biology plays a large factor in the sleep cycles of children and adolescents. As a result, the average teenager cannot fall asleep until 11: p.m. and would do best waking up at 8:00 a.m. or even later.

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Those who slept eight or more hours each night were significantly les likely to:
*Report symptoms of depression.
*fall asleep in class.
*Drink caffeinated beverages.
*Do dangerous things without thinking. (4)

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Arranging child care for younger children before and after school may be more difficult.(4)

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On the flipside, we also found that students who participate in clubs or other organized activities or work at a job for pay are significantly more likely to get insufficient sleep. (4)

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Later school  start times would  leave teens with  fewer  hours for after-school activities. (2)

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Students with less sleep have difficulty paying attention in class and are likely to have lower grades.(3)

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If schools started later, there would be improved attendance at school and decreased tardiness. (3)

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These may arise for athletic and academic competitions against schools with earlier start times and therefore an earlier dismissal. (3)

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Because of a rearranged bus schedule, younger children may have to take an earlier bus to school when it may still be dark. (4)

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Starting school later could interfere with athletic schedules and may result in a student athlete missing part of a class at the end of the day.(4)

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Negative effect of sleep deprivation, especially in people who are chronically sleepdeprived. Depresion, Obesity, substance, and increased car crashes are just some of the serious consequence. (4)

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We found significant decreases in absences and tardiness in all grades 9-12 in the school district that had instituted the latest school start times of 8:35 and 8:55 a.m.-in one district ,there was 66%   drop in tardiness (4).

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Students were now awake the first hour of class, the principal reported fewer disciplinary incidents in the halls and lunchroom, and students reported less depression. (4)

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Studies show that well rested teens are more likely to get good grades. (2)

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Early  research from 1996  through 2002 revealed that absences, tardiness, and sleepiness in school had significantly declined with later start times.  (4)

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Teens need about 9.25 hours of sleep each night. (4)

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(3) Children ages 6-13 need between 9 and 11 hours of sleep at night. Teenagers (ages 14-17) need 8-10 hours each night, However, studies have demonstrated that most American adolescents are not getting sleep. Nearly 60% of middle schoolers do not get enough sleep on school nights. For high schoolers, that number is over 70%.

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Opponents say starting classes later is expensive for school districts and limits students' time for after-school activities. (2)

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Starting the school day too early can deprive teen much needed sleep. 60 percent of middle school student  and more than  70 percent of high school students in the U.S. aren't getting the recommended 8.5 to 9.5v hours of sleep a night. (2)

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Not getting enough sleep has negative consequences such as higher risk of athletic injury, an increase of depression, and an increased risk of motor vehicle accidents . (3)

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Homework, after school jobs, and extracurricular activities keep teens up at night.(1)

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3) Both organizations want to ensure students get adequate sleep so that they are alert and prepared to learn at school.

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Studies show that teens have an increased risk of obesity, depression, anxiety and illness when they do not sleep. (1)

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Teens will just go to bed later if school starts later. (1)

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Starting school later causes transportation challenges. (1)

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Parents cannot drive their kids to school if it starts later. (1)

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There are fewer incidents of tardiness when school starts later. (1)

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Starting school later leaves less daylight for after school activities, like sports and family time. (1)

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Well rested kids learn better. (1)

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It is physically harder for teens to fall asleep early. (1)

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Teens need 8.5 hours of sleep to be healthy. (1)

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American middle and high school students often take on various extracurricular activities such as sports, clubs, and jobs which often extend into the evening hours. (3)

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The later start time may coincide with local rush-hour traffic, creating the need to discuss with the local traffic safety officials how traffic flow can be improved. (4)

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There's also the concern  that later school start times  could leave some kinds walking home in the dark.  (2)