缺乏光照有可能破坏你的醒睡周期和昼夜节律，还可能改变一种叫血清素的脑化学物质进而影响情绪。

Lack of light may upset your sleep-wake cycle and other circadian rhythms. And it may cause problems with a brain chemical called serotonin that affects mood.

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早上6：30——8：30进行活跃的户外运动；这是通过阳光唤醒你身体，开启健康的醒睡周期的主要窗口。

Get active outdoors between 6:30 and 8:30 a.m.; it's the prime window to wake your body with sunlight, kicking off a healthy sleep-wake cycle.

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