School start times should be put back to as late as 11am to combat a sleep-deprivation crisis among young people, a scientist has suggested. 一位科学家指出，学校应当把上课时间推迟到上午11点，以应对年轻人所面临的睡眠不足危机。 Paul Kelley, of ...

SINGAPORE, Oct. 27 (Xinhua) -- Boys who consistently slept nine hours or more each night throughout the week had a 51 percent lower risk of obesity and significantly less abdominal fat compared to ...