Production of the sleep hormone melatonin begins at dark.

睡眠荷尔蒙褪黑素在夜间开始分泌。

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Daylight helps trigger the production of the hormone melatonin, which helps regulate our mood and sleep patterns.

日光会刺激褪黑素的合成，这有助于使我们的情绪和睡眠模式保持规律。

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Researchers have found that light intensity can adjust the clock forward or backward by regulating the hormone melatonin.

研究人员发现，通过增强光亮调节褪黑激素可以将生物钟向前或向后调整。

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One possible explanation was disruption of the sleep hormone melatonin, the researchers said.

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Researchers found that people with CFS produced unusually high levels of the hormone melatonin, which stimulates the immune system and plays an important role in promoting sleep.

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In particular, when people spend too little time in darkness, it seems that the body suppresses release of the hormone melatonin, which among other things is thought to fight tumor growth and cancers.

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