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This study aimed to determine the prevalence and correlates of dream\u2010enactment behaviours, a hallmark of rapid eye movement sleep behaviour disorder, which is a prodrome of \u03b1\u2010synucleinopathy. This online survey was conducted between May and August 2020 in 15 countries\/regions targeting adult participants (aged \u226518\u2009years) from the general population with a harmonised structured questionnaire on sleep patterns and disorders, COVID\u201019 diagnosis and symptoms. We assessed dream\u2010enactment behaviours using the Rapid Eye Movement Sleep Behaviour Disorder Single\u2010Question Screen with an additional question on their frequency. Among 26,539 respondents, 21,870 (82.2%) answered all items that were analysed in this study (mean [SD] age 41.6\u00a0[15.8]\u00a0years; female sex 65.5%). The weighted prevalence of lifetime and weekly dream\u2010enactment behaviours was 19.4% and 3.1% and were found to be 1.8\u2010 and 2.9\u2010times higher in COVID\u201019\u2010positive cases, respectively. Both lifetime and weekly dream\u2010enactment behaviours were associated with young age, male sex, smoking, alcohol consumption, higher physical activity level, nightmares, COVID\u201019 diagnosis, olfactory impairment, obstructive sleep apnea symptoms, mood, and post\u2010traumatic stress disorder features. Among COVID\u201019\u2010positive cases, weekly dream\u2010enactment behaviours were positively associated with the severity of COVID\u201019. Dream\u2010enactment behaviours are common among the general population during the COVID\u201019 pandemic and further increase among patients with COVID\u201019. Further studies are needed to investigate the potential neurodegenerative effect of COVID\u201019.<\/jats:p>","DOI":"10.1111\/jsr.13613","type":"journal-article","created":{"date-parts":[[2022,4,27]],"date-time":"2022-04-27T02:33:47Z","timestamp":1651026827000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Dream\u2010enactment behaviours during the <scp>COVID<\/scp>\u201019 pandemic: an international <scp>COVID<\/scp>\u201019 sleep study"],"prefix":"10.1111","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2015-8775","authenticated-orcid":false,"given":"Yaping","family":"Liu","sequence":"first","affiliation":[{"name":"Li Chiu Kong Family Sleep Assessment Unit, Department of Psychiatry, Faculty of Medicine The Chinese University of Hong Kong  Hong Kong Special Administrative Region (SAR) 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