Insomnia and long sleep duration are risk factors for later work disability. The Hordaland Health Study.
Sivertsen, Børge; Øverland, Simon; Pallesen, Ståle; Bjorvatn, Bjørn; Nordhus, Inger Hilde; Mæland, John Gunnar; Mykletun, Arnstein; Journal of Sleep Research, 2009, vol. 18, issue 1, p 122, ISSN 09621105. ISBN 13652869.

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