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We evaluated the association of self-reported sleep duration and daytime napping with odds of colorectal and gastric cancer. We included 2008 incident colorectal cancer cases, 542 gastric cancer cases and 3622 frequency-matched population controls, recruited in the MCC-Spain case\u2013control study (2008\u20132013). Sleep information, socio-demographic and lifestyle characteristics were obtained through personal interviews. Multivariable adjusted logistic regression models were used to estimate odds ratios (OR) with 95% confidence intervals (CI) for cancer, across categories of sleep duration (\u2264\u20095, 6, 7, 8,\u2009\u2265\u20099\u00a0hours\/day), daytime napping frequency (naps\/week) and duration (minutes\/nap). Compared to 7\u00a0hours of sleep, long sleep was associated with increased odds of colorectal (OR\n                    <jats:sub>\u22659\u00a0hours<\/jats:sub>\n                    : 1.59; 95%CI 1.30\u20131.94) and gastric cancer (OR\n                    <jats:sub>\u22659\u00a0hours<\/jats:sub>\n                    : 1.95; 1.37\u20132.76); short sleep was associated with increased odds of gastric cancer (OR\n                    <jats:sub>\u22645\u00a0hours<\/jats:sub>\n                    : 1.32; 0.93\u20131.88). Frequent and long daytime naps increased the odds of colorectal (OR\n                    <jats:sub>6\u20137 naps\/week, \u226530\u00a0min<\/jats:sub>\n                    : 1.32; 1.14\u20131.54) and gastric cancer (OR\n                    <jats:sub>6\u20137 naps\/week, \u226530\u00a0min<\/jats:sub>\n                    : 1.56; 1.21\u20132.02). Effects of short sleep and frequent long naps were stronger among participants with night shift-work history. Sleep and circadian disruption may jointly play a role in the etiology of colorectal and gastric cancer.\n                  <\/jats:p>","DOI":"10.1038\/s41598-021-91275-3","type":"journal-article","created":{"date-parts":[[2021,6,3]],"date-time":"2021-06-03T06:14:48Z","timestamp":1622700888000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":35,"title":["Sleep duration and napping in relation to colorectal and gastric cancer in the MCC-Spain study"],"prefix":"10.1038","volume":"11","author":[{"given":"Kyriaki","family":"Papantoniou","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gemma","family":"Casta\u00f1o-Vinyals","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana","family":"Espinosa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michelle C.","family":"Turner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vicente","family":"Mart\u00edn-S\u00e1nchez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Delphine","family":"Casabonne","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nuria","family":"Aragon\u00e9s","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"In\u00e9s","family":"G\u00f3mez-Acebo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eva","family":"Ardanaz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jose-Juan","family":"Jimenez-Moleon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pilar","family":"Amiano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana","family":"Molina-Barcel\u00f3","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juan","family":"Alguacil","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guillermo","family":"Fern\u00e1ndez-Tard\u00f3n","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9 Mar\u00eda","family":"Huerta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalia","family":"Hern\u00e1ndez-Segura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beatriz","family":"Perez-Gomez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"Llorca","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juana","family":"Vid\u00e1n-Alli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roc\u0131o","family":"Olmedo-Requena","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leire","family":"Gil","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carmen","family":"Casta\u00f1on-L\u00f3pez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marina","family":"Pollan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manolis","family":"Kogevinas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victor","family":"Moreno","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,6,3]]},"reference":[{"key":"91275_CR1","doi-asserted-by":"publisher","first-page":"394","DOI":"10.3322\/caac.21492","volume":"68","author":"F Bray","year":"2018","unstructured":"Bray, F. et al. 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