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We quantified cohort prevalence of operationally defined sleep disorders and assessed the patterning of sleep health dimensions across key sociodemographic and clinically relevant variables.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>A total of 183 704 individuals completed at least one module of the questionnaire after email invitation (representing 56 per cent of those with an active email address), and an additional 1352 individuals completed via the participant website. In total 185\u2009056 individuals were included in the analysis. Respondents were predominantly from a White ethnic background (96.8%), had a mean age of 69.9 (SD, 7.5) years, 57.9 per cent were female, and 25.5 per cent were in employment. Compared to non-respondents, respondents were more likely to be female, tended to be better educated, healthier, and exhibit lower levels of socioeconomic deprivation, although baseline sleep variables were similar between respondents and non-respondents. Around 40 per cent of respondents reported sleep duration less than 7\u00a0h, and 49 per cent reported poor sleep quality (Pittsburgh Sleep Quality Index &amp;gt;5). Approximately one-quarter (25.2%) met the criteria for at least one operationally defined sleep disorder, with insomnia being the most common (14.4%) followed by obstructive sleep apnea (8.0%), restless legs syndrome (4.1%), and frequent nightmares (3.7%). Sleep disorders were associated with higher levels of anxiety, depression, fatigue, and cognitive complaints.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Poor sleep quality and operationally defined sleep disorders are common in the UK Biobank cohort. Sleep questionnaire data can now be integrated with a range of biomedical information to advance understanding of sleep.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/sleep\/zsag068","type":"journal-article","created":{"date-parts":[[2026,3,6]],"date-time":"2026-03-06T12:40:11Z","timestamp":1772800811000},"source":"Crossref","is-referenced-by-count":1,"title":["Sleep and circadian health in the UK Biobank: report on the 2023 sleep questionnaire enhancement"],"prefix":"10.1093","volume":"49","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1158-5425","authenticated-orcid":false,"given":"Katrina Y K","family":"Tse","sequence":"first","affiliation":[{"name":"Nuffield Department of Clinical Neurosciences, Sir Jules Thorn Sleep and Circadian Neuroscience Institute, University of Oxford , Oxford ,","place":["United 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,","place":["United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jo","family":"Holliday","sequence":"additional","affiliation":[{"name":"Nuffield Department of Population Health, University of Oxford , Oxford ,","place":["United Kingdom"]},{"name":"Scientific Study Development Group, UK Biobank , Stockport ,","place":["United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Colin A","family":"Espie","sequence":"additional","affiliation":[{"name":"Nuffield Department of Clinical Neurosciences, Sir Jules Thorn Sleep and Circadian Neuroscience Institute, University of Oxford , Oxford ,","place":["United Kingdom"]},{"name":"Big Health Inc , London ,","place":["United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5314-1008","authenticated-orcid":false,"given":"Derk-Jan","family":"Dijk","sequence":"additional","affiliation":[{"name":"Surrey Sleep Research Centre, University of 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