A sleep study involving more than 3,100 students at four Massachusetts public high schools produced some eye-opening results, according to Roberts colleague, Professor Michael Smolensk.

• 罗伯兹教授的同事、迈克尔?斯摩伦斯克教授说，一项针对马萨诸塞四所公立中学3100多名学生开展的睡眠研究得出的结果很有启发。