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Objective data were available from wave 8. The SHARE Cognitive Instrument (SHARE-Cog) assessed cognition. Participants were divided into three groups: probable dementia, cognitive impairment no dementia (CIND), and normal cognition (NC). Survey-weighted generalized linear regression models were used to compare groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>88,889 interviews were included (55% females; mean age 68.88), categorized as: probable dementia 7%, CIND 12%, and NC 81%. While, in the unadjusted analysis, a characteristic \u2018inverted U\u2019 shaped association was observed between sleep duration and cognition, only the association between cognition and longer sleep durations \u226510\u2005hours remained statistically significant after adjusting for potential confounders. Cognitive impairment was significantly associated with subjective reports of recent trouble sleeping, weekly use of medication to aid sleep, and daytime napping, although only the association with daytime napping remained statistically significant after adjusting for potential confounders.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>This analysis confirmed an association between sleep duration \u226510\u2005hours and lower cognitive scores among community-dwelling middle-aged and older Europeans. Cognitive impairment was also significantly associated with daytime napping. Further research is required to understand the clinical significance of these findings and establish the underlying causal relationships.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/13872877261481093","type":"journal-article","created":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T16:18:04Z","timestamp":1788452284000},"page":"1731-1744","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Associations between sleep and cognition among middle-aged and older adults in Europe"],"prefix":"10.1177","volume":"113","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-9767-5907","authenticated-orcid":false,"given":"Patrick","family":"Crowley","sequence":"first","affiliation":[{"name":"Mercy University Hospital"},{"name":"University College Cork"},{"name":"Mercy University Hospital"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark R.","family":"O'Donovan","sequence":"additional","affiliation":[{"name":"University College Cork"},{"name":"Mercy University Hospital"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evelyn","family":"Flanagan","sequence":"additional","affiliation":[{"name":"Mercy University Hospital"},{"name":"University College Cork"},{"name":"Mercy University Hospital"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1499-673X","authenticated-orcid":false,"given":"R\u00f3n\u00e1n","family":"O'Caoimh","sequence":"additional","affiliation":[{"name":"Mercy University Hospital"},{"name":"University College Cork"},{"name":"Mercy University Hospital"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,9,3]]},"reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.5665\/sleep.1846"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1093\/sleep\/27.7.1255"},{"key":"e_1_3_3_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jsmc.2016.10.008"},{"key":"e_1_3_3_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.sleep.2024.03.040"},{"key":"e_1_3_3_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.neuron.2017.02.004"},{"key":"e_1_3_3_7_2","doi-asserted-by":"publisher","DOI":"10.5665\/SLEEP.1170"},{"key":"e_1_3_3_8_2","doi-asserted-by":"publisher","DOI":"10.1161\/CIRCULATIONAHA.111.025858"},{"key":"e_1_3_3_9_2","doi-asserted-by":"publisher","DOI":"10.2174\/1381612811319130009"},{"key":"e_1_3_3_10_2","doi-asserted-by":"publisher","DOI":"10.1001\/archinte.165.8.863"},{"key":"e_1_3_3_11_2","doi-asserted-by":"publisher","DOI":"10.1158\/1055-9965.EPI-12-1227-T"},{"key":"e_1_3_3_12_2","doi-asserted-by":"publisher","DOI":"10.1016\/S1474-4422(14)70172-3"},{"key":"e_1_3_3_13_2","volume-title":"Global status report on the public health response to dementia","author":"WHO","year":"2021","unstructured":"WHO. 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