|
Lots of people rely on the beep-beep-beep of an alarm clock. And while some start the morning with a cheerful press of the off button and a catlike stretch, others wake after a whack of the snooze button and another 10 minutes of rest. But do those extra few minutes help? One expert, David Dinges, chief of the Division of Sleep and Chronobiology in the Department of Psychiatry at the University of Pennsylvania's Perelman School of Medicine, awakens the controversy. 很多人起床都要依赖闹钟铃响的哔哔声。虽然有些人的早晨是从乐呵呵地按下“关闭”键然后伸个懒腰开始的，另一些人则是猛按“小睡”键、接着再躺10分钟后才醒来的。但多睡这几分钟真的管用吗？宾夕法尼亚大学佩雷尔曼医学院(University of Pennsylvania's Perelman School of Medicine)精神病学部睡眠与生物钟学分部(Division of Sleep and Chronobiology in the Department of Psychiatry)主管、睡眠专家戴维·丁格斯(David Dinges)引发了人们对这个话题的争论。 Efficient sleep 有效睡眠 Most sleep experts agree that seven to eight hours of shut-eye per night is optimal for adults. In a 2007 paper based on the annual American Time Use Survey, Dr. Dinges found 32.6% of Americans self-reported that they got less than 7.5 hours by going to bed late, then relied on alarm clocks to wake up. Surprisingly, the result isn't a population of groggy people, but one that is getting more efficient sleep. | 
