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If so, sleep therapies bear important potential to slow progression in these diseases.<\/jats:p><\/jats:sec><jats:sec><jats:title>Findings<\/jats:title><jats:p>This cycle is challenging to study, as its bidirectional nature renders cause difficult to disentangle from effect. Likewise, well-controlled intervention studies are often impractical in the setting of established neurodegenerative disease. It is this that makes understanding sleep and circadian abnormalities in Huntington\u2019s disease (HD) important: as a monogenic fully penetrant neurodegenerative condition presenting in midlife, it provides a rare opportunity to study sleep and circadian abnormalities longitudinally, prior to and throughout disease manifestation, and in the absence of confounds rendered by age and comorbidities. It also provides potential to trial sleep therapies at a preclinical or early disease stage. Moreover, its monogenic nature facilitates the development of transgenic animal models through which to run parallel pre-clinical studies. HD, therefore, provides a key model condition through which to gain new insights into the sleep-neurodegeneration interface.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Here, we begin by summarising contemporary knowledge of sleep abnormalities in HD, and consider how well these parallel those of Alzheimer\u2019s and Parkinson\u2019s as more common neurodegenerative conditions. We then discuss what is currently known of the sleep-neurodegeneration cyclical relationship in HD. We conclude by outlining key directions of current and future investigation by which to advance the sleep-neurodegeneration field via studies in HD.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00415-020-10334-3","type":"journal-article","created":{"date-parts":[[2020,12,23]],"date-time":"2020-12-23T09:04:04Z","timestamp":1608714244000},"page":"2275-2283","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["The sleep and circadian problems of Huntington\u2019s disease: when, why and their importance"],"prefix":"10.1007","volume":"268","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6980-6059","authenticated-orcid":false,"given":"Z.","family":"Voysey","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S. V.","family":"Fazal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. 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