American children are more sleep-deprived than ever, with more than a quarter reporting that they doze off in class at least once a week, a study published yesterday says.

• 美国睡眠基金会28日公布的一项调查报告显示，当今的美国青少年比以往任何年代都缺觉，超过四分之一的高中生每周至少有一次在课堂上坠入梦乡。专家认为，电脑、视充斥孩子卧室是祸因之一。