There is an extra hour of darkness on winter mornings.
冬天的早晨天亮晚一个小时。
The natural internal clock that controls our 24-hour cycle of sleep and waking, circadian rhythms are easily upset by changes in schedule, and they're greatly affected by light and darkness.
控制我们24小时睡眠和清醒生理周期的自然生物钟，生理的节奏很容易会被改变的时间表扰乱，他们深受光线和黑暗的影响。
Their studies show that our circadian body clocks, set by light and darkness, never benefit from gaining an "extra" hour of sunlight to the end of the day during daylight saving time.
他们的研究显示，我们的生理时钟，主要受日夜调节，不可能从日光节约期间，傍晚多出来的那一小时日照里获得任何好处。
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