What we do know is that people tend to have different kinds of nightmares at different points during the sleep cycle.
我们现在所知道的就是，人们在睡眠周期的不同阶段往往会做不同类型的噩梦。
The clock, called Sleep Smart, measures your sleep cycle, and waits for you to be in your lightest phase of sleep before rousing you.
这个被称为“智能睡眠”的闹钟会测量你的睡眠周期，等你进入最浅的睡眠阶段后再叫醒你。
Typically, the preferred sleep cycle is delayed in adolescents, which leads to many students not feeling sleepy until much later in the evenings.
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。
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