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Some of us feel well-rested after a solid eight hours of sleep. For others, closer to nine feels best. For others still, a little less will do. How much sleep we prefer to get is highly subjective -- but how much sleep we need is a bit more concrete. 我们中的一些人，睡足了8个小时后觉得无比神清气爽。对于另一些人来说，睡差不多9个小时为最佳。还有一些人，稍微不足这点时间刚刚好。我们更愿意睡多久是非常主观的——但是我们需要多少睡眠就是有那么一点具体有形的了。 After web analytics showed the vast popularity of the How Much Sleep Do We Really Need? feature of the National Sleep Foundation's (NSF) website, a panel of experts set about to reassure that the information provided there was the most accurate and up to date. 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 2017. From the 312 articles reviewed, the experts were able to fine-tune existing sleep duration recommendations as detailed below: | 
