(单选题)
Which of the following helps teenagers sleep well?
A.They should do different things before sleeping.
B.They should sleep for more than nine hours a day.
C.They should not use any digital devices during the daytime.
D.They’d better go to sleep and get up at the same time every day.
参考答案：D
参考解析：
细节理解题。根据最后一段第四句“Other suggestions include: try to go to sleep and wake up at the same time every day, even on weekends and during holidays, and do the same relaxing things before bed each night, like listening to soft music.”可知，他们需要坚持固定的睡觉和起床时间。故选D。
知识点：
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