Beginning at adolescence, kids have what's called a delayed sleep phase, where they start sleep later and sleep later in the morning.

青春期伊始，孩子们会产生所谓的睡眠相位后移症，症状表现为入睡比平时晚，起床也比平时晚。

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It's particularly surprising to see that a boy's puberty can be delayed as a result of events that happen in adolescence. We've previously assumed that these things are 'locked-in' in early childhood.

尤其令人惊奇是我们发现儿童的青春期发育与青少年时期所经历的事情有某种关系，而原本我们一直认为青春期发育是在儿童期就已经是固定下来的。

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