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This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

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The midday nap is a preschool tradition.

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But is it necessary?

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Some preschools plan to eliminate this downtime to fit in more teaching.

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Which could come at the expense of learning.

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Because a study suggests that the snooze may help kids retain information they learned earlier in the day.

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The work is published in PLOS ONE.

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To see how naps affect academic performance, researchers taught 40 preschoolers between the ages of 3 and 6 to perform a memory task.

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After a few hours of break time the children either stayed awake or got to nap, sleeping for an average of 77 minutes.

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Although napping made no significant difference to feelings of sleepiness, it did help enhance memory.

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When tested later in the day, students who had rested performed better.

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Even the next day, the children who had napped after the initial lesson still retained more information.

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The benefit was greatest for students who took naps regularly, not just during the study.

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Which suggests schools may want to keep sleep on the syllabus.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

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