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by makemoniesonlin 2442 days ago
Because it is tough for high school students to fall asleep early enough.

"In the teenage years, the hormonal response to the 24-hour daily light/dark exposure that influences circadian rhythm is altered, making adolescents physiologically yearn to stay awake later at night and to remain asleep later in the day."

https://www.neurologytimes.com/blog/teenage-circadian-rhythm