Evening light environments can be designed to consolidate and increase the duration of REM-sleep.

Sci Rep · 2022 · PMC9130237 · PMID 35610265

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marginally significantno p-value reported

However, BDLE had an additional, albeit marginally significant effect over and above the effect of phase-shift, explaining nearly all the variance in the effect of phase-shift.

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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.