Bright Light Increases Alertness and Not Cortisol in Healthy Men: A Forced Desynchrony Study Under Dim and Bright Light (I).

J Biol Rhythms · 2022 · PMC9326799 · PMID 35686534

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highly significantno p-value reported

However, given (1) that power calculations show that significant light effects on subjective sleepiness can already be found with merely 5 participants per light condition and (2) we report highly significant findings ( Table 1 ), this seems unlikely.

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