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Lifestyle factors are known to play a role, but they alone cannot account for the surge. One factor that\u2014although being recognized as important\u2014has not been explored in detail so far is the influence of circadian rhythms. Sleep and circadian rhythm disruption are known as key factors in neurodegeneration, and their occurrence during early disease stages suggests a causal role in the pathogenesis. Isolated rapid eye movement (REM) sleep behavior disorder (iRBD) has been identified as a prodromal state of \u03b1\u2010synucleinopathies, such as Parkinson's disease, Lewy body dementia, and multiple system atrophy offering a window for insights into the early development of these diseases. Even though REM sleep is the sleep state most pronounced, driven and modulated by the circadian timing system, specific circadian abnormalities have not been described in iRBD. Novel experimental and clinical approaches exploiting the molecular circuitry underlying circadian timekeeping hold promise to disentangle some of the pathophysiologic mechanisms of \u03b1\u2010synucleinopathies. In this review, we summarize current knowledge on sleep and circadian rhythm disruptions in \u03b1\u2010synucleinopathies with an emphasis on molecular aspects and therapeutic potentials. These insights might contribute to our understanding of the pathogenesis of neurodegenerative diseases and may allow therapeutic interventions addressing the disturbed circadian system at the early stage of disease.<\/jats:p>","DOI":"10.1111\/apha.13966","type":"journal-article","created":{"date-parts":[[2023,3,23]],"date-time":"2023-03-23T10:29:51Z","timestamp":1679567391000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Sleep and circadian rhythms in \u03b1\u2010synucleinopathies\u2014Perspectives for disease modification"],"prefix":"10.1111","volume":"238","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0430-5878","authenticated-orcid":false,"given":"Dieter","family":"Kunz","sequence":"first","affiliation":[{"name":"Institute of Physiology, Sleep Research &amp; Clinical Chronobiology Charit\u00e9 \u2013 Universit\u00e4tsmedizin Berlin  Berlin Germany"},{"name":"Clinic for Sleep\u2010 &amp; Chronomedicine, 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