Sleep and Circadian Rhythm in Relation to COVID-19 and COVID-19 Vaccination-National Sleep Survey of South Korea 2022.

J Clin Med · 2023 · PMC9967239 · PMID 36836053

Europe PMC DOI

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might be significantno p-value reported

Fourth, we did not investigate psychiatric symptoms, which might be significant contributors to sleep problems in the context of the SARS-CoV-2 pandemic.

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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.