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The midday nap is a preschool tradition.
睡午覺就像是學齡前兒童的必修課。
But is it necessary?
但這對他們來說真的有必要嗎？
Some preschools plan to eliminate this downtime to fit in more teaching which could come at the expense of learning.
一些學前班計劃取消這項內容以便安排更多的教學內容，從而帶來更多的學習時間。
Because a study suggests that the snooze may help kids retain information they learned earlier in the day.
但是一項研究顯示短暫的休息也許能幫助孩子們牢記當天早些時候所學到的知識。
The work is published in PLOS ONE.
這項研究已在《公共科學圖書館》期刊上發(fā)表。
To see how naps affect academic performance, researchers taught 40 preschoolers between the ages of 3 and 6 to perform a memory task.
為了檢測午睡在科學研究上的影響，研究人員對40名3到6歲的學齡前兒童進行了記憶力方面的相關測試。
After a few hours of break time the children either stayed awake or got to nap, sleeping for an average of 77 minutes.
經過幾小時的學習后孩子們被分為兩組，一組保持清醒，而另一組則進行大概平均77分鐘的午睡。
Although napping made no significant difference to feelings of sleepiness, it did help enhance memory.
盡管沒有為睡眠本身帶來明顯差異，但午睡確實能幫助增強記憶。
When tested later in the day, students who had rested performed better.
而在當天隨后所進行的測試中，之前短暫休息的學生表現(xiàn)得更好些。
Even the next day, the children who had napped after the initial lesson still retained more information.
甚至到了第二天，這些午睡過的孩子們仍然能記得更多已學過知識的信息。
The benefit was greatest for students who took naps regularly, not just during the study.
經常午睡確實能對學習有幫助，不僅僅是在學習階段。
Which suggests schools may want to keep sleep on the syllabus.
這項研究表明學校也許想把午睡也列入教學大綱了吧。
