🌏Article
A study has found that later school start times are linked to more sleep for middle school and high school students, with some students reporting better quality sleep too.
According to data from 2016, the average start time for school in the US was about 8:10 a.m. — and some schools even started before 7:30 a.m. The US Centers for Disease Control and Prevention say that children aged 6-12 need 9-12 hours of sleep a night, and those aged 13-18 need 8-10 hours.
However, most US teenagers go to sleep after 10:15 p.m., so getting enough sleep before getting up for school can be difficult.
The recent study, published in the journal Sleep, used data from about 28,000 students in a school district in Colorado.
In 2017, the district changed its start times to be 40-60 minutes later for middle schools, so classes began at 8:50 a.m. High school classes were moved 70 minutes, starting at 8:20 a.m.
The students in the study completed annual surveys over three years, before and after their school start times changed. About one in 10 high school students reported better quality sleep, and one in five said they felt less sleepy during the day.

🌏Summary
美國疾病管制與預防中心表示，6歲至12歲的兒童一個晚上需要9到12個小時的睡眠，13歲至18歲的孩童則需要8到10個鐘頭。根據2016年的數據，美國學校平均上學時間約為早上8點10分——部分學校甚至在早上7點30分前就開始。 不過，多數的美國青少年在晚上10點15分之後才睡覺，所以在上學之前獲得充足的睡眠可能有難度。一項發表在《睡眠》期刊的研究發現，上學時間延後與國高中學生的睡眠時間增加有所關聯，也有部分學生回報睡眠品質變更好。大約十位高中生中就有一位回報睡眠品質變更好，每五位中就有一位說他們在白天的時候比較不會想睡覺。

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quality品質
district行政區

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