听课
课程多端同步更新，充分利用零碎时间。做题
海量精选试题，想练就练，瞬间提分。答疑
网校名师24小时在线答疑解惑。直播
名师大咖面对面，有问有大收获多。网络分析显示，由国家睡眠基金会网站发起的“我们到底需要睡多久”非常受欢迎，并且专家组开始着手确定上面提供的信息，它们是最为精确的，而且是最新的数据。
To do so, a panel of six sleep experts and 12 other medical experts from organizations including the American Academy of Pediatrics, the American Geriatrics Society, the American Psychiatric Association and the Society for Research in Human Development, conducted a formal literature review. The panel focused on the body of research surrounding sleep duration in healthy human subjects that had been published in peer-reviewed journals between 2004 and 2014. From the 312 articles reviewed, the experts were able to fine-tune existing sleep duration recommendations as detailed below:
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