Midwinter insomnia in the subarctic region: Evening levels of serum melatonin and cortisol before and after treatment with bright artificial light

• Published in: Acta Psychiatrica Scandinavica
• Main Authors: Hansen, T., Bratlid, T., Lingjärde, O., Brenn, T.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1987
• Subjects: Psychiatry and Mental health; Arctic; Midwinter; Subarctic
• Online Access: http://dx.doi.org/10.1111/j.1600-0447.1987.tb02811.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1600-0447.1987.tb02811.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1600-0447.1987.tb02811.x

ABSTRACT— “Midwinter insomnia” (MI), mainly characterized by difficulties in falling asleep at night, is a common complaint during the period of obscuration or “dark period” north of the arctic circle. We hypothesize that MI is a result of a phase delay of the sleep‐wake cycle due to insufficient ex...