Social Factors Can Outweigh Biological Ones in Determining Night Shift Safety
通过分析十年矿难数据，发现夜班事故在周日晚上（即第四个夜班）最严重，与生物钟适应预测的逐渐减少模式相反，表明周末社会干扰比生物因素影响更大。
Ten years of mining accidents were surveyed in order to determine the pattern of changes over a seven-night span of duty. Sunday nights always occurred as the fourth night shift. Contrary to the gradually decreasing pattern predicted by biological clock adjustment, Sunday nights were by far the worst for accidents, suggesting that the social disruptions of the night worker on weekends may be far more potent than the biological ones.