你给时钟设定了你想要醒来的最晚时间，然后它会在之前的浅睡眠阶段按时叫醒你。

You program the clock with the latest time at which you want to be wakened, and it then duly wakes you during the last light sleep phase before that.

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最终，这和你设定时间睡觉和起床的睡眠周期所产生的效果是一样的。

Eventually, this will become just as much of your sleep cycle as your set times for going to sleep and waking up.

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每一轮的睡眠持续90分钟，所以在设定闹钟的时候时间设置应为1.5小时的倍数，这样更容易把你叫醒。

Each sleep cycle lasts 90 minutes. Set your alarm clock to go off after a multiple of an hour and a half, and it will be easier to wake up.

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