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Women who live in areas with higher levels of outdoor light at night may be at higher risk for breast cancer, according to a study from Harvard T.H. Chan School of Public Health. The link was stronger among women who worked night shifts. 哈佛大学陈曾熙公共卫生学院的一项研究表示，那些在夜晚户外光线较强地区生活的女性更容易患上乳腺癌。对于那些上夜班的女性来说，这之间有着更紧密的联系。 Previous studies have suggested that exposure to light at night may lead to decreased levels of the hormone melatonin , which can disrupt circadian rhythms—our internal “clocks” that govern sleepiness and alertness—and, in turn, lead to increased breast cancer risk. 先前的研究指出，晚上暴露于光线中可能会降低褪黑激素的含量，扰乱生理节奏，也就是我们身体内部控制睡意和敏捷性的“生物钟”，继而增加罹患乳腺癌的风险。 | 
