该研究报告发表在《睡眠》杂志上，其作者称，青少年睡眠越多，越有益于他们的心理健康。

The authors of the study, published in the journal sleep, said that the more sleep adolescents get the better it is for their mental health.

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通常，青少年的睡眠周期会延迟，这导致许多学生直到晚上很晚才感到困倦。

Typically, the preferred sleep cycle is delayed in adolescents, which leads to many students not feeling sleepy until much later in the evenings.

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这就是研究人员如何使用图表来显示英国青少年每天的睡眠时间。

It is how a researcher used a graphic to show the number of hours spent sleeping by British teenagers each day.

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