Why are adolescents not getting enough sleep?

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During adolescence, circadian rhythms are delayed, making it extremely difficult for teens to fall asleep prior to 11 p.m. and wake up prior to 8 a.m. Although a teenager's sleep quality can be made worse by excessive academic/extra-curricular demands, poor sleep hygiene, or misuse of technology at bed-time, it is largely driven by a universal delay in the body’s sleep clock during adolescence. Early school hours play a significant role as they force teens to wake up before they have achieved the minimum amount of sleep required for optimum health and performance.