Insomnia and long sleep duration are risk factors for later work disability. The Hordaland Health Study.
Sivertsen B; Øverland S; Pallesen S; Bjorvatn B; Nordhus IH; Maeland JG; Mykletun A; Journal Of Sleep Research, 2009, vol. 18, issue 1, p 122, ISSN 13652869. ISBN 13652869.

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