Sleepiness is a signal to go to bed: data and model simulations.

Sleep · 2021 · PMC8503825 · PMID 33991415

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highly significantno p-value reported

The range of variation in total sleep duration for 64% of this nonpathological adult sample was between 5:30 and 9:00 h, which equated to a modest yet highly significant change of 0.55 points in KSS.

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near significanceno p-value reported

There was a significant interaction between evKSS8 and bedtime category, with a stronger association between evKSS8 and bedtime in early sleepers compared to late sleepers ( F (2,683) = 2.91, p = 0.055; near significance).

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