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.
最新研究发现：女性比男性的睡眠周期更短、更早，所以女性往往比男性睡得更早、醒得更早。
New research has found that women tend to have shorter, earlier sleep cycles then men.
睡到自然醒。 不要让闹钟或狗叫声打扰你的睡眠周期。
Try to awaken naturally,without the help of an alarm clock or barking dog that can disrupt your dream cycle.
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