Daytime naps, motor memory consolidation and regionally specific sleep spindles.

PLoS One · 2007 · PMC1828623 · PMID 17406665

Europe PMC DOI

hedged sentence

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highly significantno p-value reported

At testing, subjects that did not nap showed no significant performance improvement, yet those that did nap expressed a highly significant consolidation enhancement.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.