Barely Significant
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The effects of daytime napping on psychophysiological measures in physically active individuals and athletes: A systematic review, meta-analysis, and meta-regression, with assessment of the certainty of evidence.

Biol Sport · 2026 · PMC12884900 · PMID 41668951

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This inconsistency between studies could explain why, despite the observed large effect size, napping’s impact on sleepiness did not reach statistical significance.

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