呼吸运动是一种节律性的活动，受呼吸中枢的调节。
Respiratory movement, known as a kind of rhythmic activity, can be regulated by respiratory center.
这是一种被称为睡眠类型的昼夜节律的良性变化。
This is a benign variation within circadian rhythms known as a chronotype.
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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