Clock genes is prevalent in biological world, and they can bring and control biological circadian rhythm.

生物钟基因普遍存在于生物界，其作用在于产生和控制昼夜生物节律的运转。

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Firstly , overnight work is dangerous because it disrupts the circadian rhythm, the body's biological clock. The hormone melatonin, which can suppress tumor development, is normally produced at night.

首先，通宵工作是危险的，因为它打乱了生理节奏，身体的生物钟，可以阻止肿瘤生长的黑色素，通常是在晚上产生的。

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Melatonin (MT) is secreted by the pineal gland and has obvious biological rhythmicity including circadian, season rhythm and life rhythm (aging clock).

褪黑素(MT)由松果腺分泌，具有明显的生物节律性，包括昼夜节律、季节节律和生命周期节律。

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