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.
我們中的一些人，睡足了8個小時后覺得無比神清氣爽。對于另一些人來說，睡差不多9個小時為最佳。還有一些人，稍微不足這點時間剛剛好。我們更愿意睡多久是非常主觀的——但是我們需要多少睡眠就是有那么一點具體有形的了。

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.
網(wǎng)絡分析顯示，由國家睡眠基金會網(wǎng)站發(fā)起的“我們到底需要睡多久”非常受歡迎，并且專家組開始著手確定上面提供的信息，它們是最為精確的，而且是最新的數(shù)據(jù)。

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:
專家組來自美國兒科學會、美國老年醫(yī)學會、美國精神醫(yī)學學會、人類社會發(fā)展研究這些組織的6名睡眠專家和另外12位醫(yī)學專家，擬定了一份正式的文獻綜述。專家組專注于2004年到2014間發(fā)表的同行評議學術期刊上，健康人體的睡眠時間議題。從312篇的文獻綜述中，專家們得以調整已有的睡眠時長推薦，歸結具體如下。

Newborns (0-3 months): 14-17 hours
新生兒（0-3個月）：14-17個小時

Infants (4-11 months): 12-15 hours
嬰兒（4-11個月）：12-15小時

Toddlers?(1-2 years): 11-14 hours
剛學會走路的孩子（1-2歲）：11-14個小時

Preschoolers (3-5): 10-13 hours
學齡前兒童（3-5歲）：10-13個小時

School-Age Children (6-13): 9-11 hours
學齡兒童（6-13歲）：9-11個小時

Teenagers (14-17): 8-10 hours
青少年（14-17歲）：8-10個小時

Young Adults (18-25): 7-9 hours
青壯年（18-25歲）：7-9個小時

Adults (26-64): 7-9 hours
成年人（26-64歲）：7-9個小時

Older Adults (65+): 7-8 hours
老年人（65歲以上）：7-8個小時

“This is the first time that any professional organization has developed age-specific recommended sleep durations based on a rigorous, systematic review of the world scientific literature relating sleep duration to health, performance and safety,” Charles A. Czeisler, Ph.D., M.D., professor of sleep medicine at Harvard Medical School and chairman of the board of the National Sleep Foundation, said in a statement.
“這是第一次有專業(yè)的組織，擬寫一份年齡劃分的睡眠時長推薦表，其基于的是嚴謹?shù)?，系統(tǒng)的檢閱全球關于健康、性能和安全考慮的睡眠時長科學文獻，”查爾斯·A·斯勒醫(yī)學博士——哈佛醫(yī)學院睡眠治療的教授，同時也是國家睡眠基金會理事會的董事長在一份聲明里說道。