Many people are now exposed to unnatural light cycles, and that may have real consequences for our health.

现在，许多人接触到非自然光循环，也许确实影响到我们的健康。

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Researchers raised baby mice from birth to weaning in either "summer" light cycles of 16 hours of light and eight hours of dark or "winter" cycles of eight hours of light and 16 hours of dark.

研究人员们将一组小鼠在“夏季”模拟光照周期下（光照16小时，无光照8小时）从出生培养至断乳期，而将另一组小鼠在“冬季”模拟光照周期下（光照8小时，无光照16小时）培养至相同时间。

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Our circadian clock, or biological timing system, governs our daily cycles of feeding, activity and sleep, with respect to external dark and light cycles.

我们的生物钟或生物调时系统，对外界黑夜和天明循环的反应，控制着我们每天进食、活动和睡眠的循环。

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As congestion builds on one street relative to another, it adjusts traffic-light cycles to give more green time to the congested lanes.

FORBES: Photograph: Tim Rue

Light and dark cycles cause changes in levels of brain chemicals such as melatonin.

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The mask is designed so that light passing through its thickest region is slowed by exactly two cycles compared with that passing through its thinnest.

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