Insomnia during the “dark period” in northern Norway

• Published in: Acta Psychiatrica Scandinavica
• Main Authors: Lingærde, O., Bratlid, T., Hansen, T.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1985
• Subjects: Psychiatry and Mental health; Midwinter; Norway; Northern Norway
• Online Access: http://dx.doi.org/10.1111/j.1600-0447.1985.tb05064.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-0447.1985.tb05064.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-0447.1985.tb05064.x

Abstract Midwinter insomnia (M1) is an initial type insomnia that is typically seen north of the Polar Circle during the “dark period”, when the sun docs not rise above the horizon. The cause of MI is not known, but it seems reasonable to assume that it is (he expression of a phase delay of the slee...