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dc.contributor.authorSivertsen, Børge
dc.contributor.authorFriborg, Oddgeir
dc.contributor.authorPallesen, Ståle
dc.contributor.authorVedaa, Øystein
dc.contributor.authorHopstock, Laila Arnesdatter
dc.date.accessioned2021-04-01T22:08:21Z
dc.date.available2021-04-01T22:08:21Z
dc.date.issued2020-11-29
dc.description.abstractWhile some diseases and human behaviors fluctuate consistently with season, the extent of seasonal variations in sleep, especially at high latitudes, is less consistent. We used data from a geographic region (69º North) with extremely large seasonal differences in daylight that had the participants blinded for the current study’s hypotheses. Data were derived from the Tromsø Study (2015–2016), an ongoing population-based study in Northern Norway comprising citizens aged 40 years and older (n = 21,083, participation = 64.7%). The sleep parameters included bedtime, rise time, sleep onset latency (SOL), and total sleep time. Insomnia was defined according to recent diagnostic criteria (International Classification of Sleep Disorders; ICSD-3). We found some evidence of monthly or seasonal variation in sleep problems. Insomnia was most common during the winter months among men, but not women. No seasonal or monthly effects were observed for sleep duration. SOL was slightly longer during the winter months, but the differences were small and hardly of any clinical relevance. The small or non-existing seasonal variation in sleep and sleep difficulties indicate that extreme seasonal variation in daylight is of little influence on sleep status. The city of Tromsø is a modern city with considerable level of artificial light, which may contribute to the observed rather stabile sleep patterns throughout the year.en_US
dc.descriptionThis is an Accepted Manuscript of an article published by Taylor & Francis in <Chronobiology International</i> on 29 November 2020, available online: <a href=https://doi.org/10.1080/07420528.2020.1845191>https://doi.org/10.1080/07420528.2020.1845191</a>.en_US
dc.identifier.citationSivertsen BS, Friborg O, Pallesen S, Vedaa Ø, Hopstock LA. Sleep in the land of the midnight sun and polar night: The Tromsø study. Chronobiology International. 2020:1-10en_US
dc.identifier.cristinIDFRIDAID 1858417
dc.identifier.doi10.1080/07420528.2020.1845191
dc.identifier.issn0742-0528
dc.identifier.issn1525-6073
dc.identifier.urihttps://hdl.handle.net/10037/20764
dc.language.isoengen_US
dc.publisherTaylor & Francisen_US
dc.relation.journalChronobiology International
dc.relation.urihttps://www.tandfonline.com/doi/full/10.1080/07420528.2020.1845191
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2020 The Author(s)en_US
dc.subjectVDP::Medical disciplines: 700::Health sciences: 800::Epidemiology medical and dental statistics: 803en_US
dc.subjectVDP::Medisinske Fag: 700::Helsefag: 800::Epidemiologi medisinsk og odontologisk statistikk: 803en_US
dc.titleSleep in the land of the midnight sun and polar night: The Tromsø studyen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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