2021

• Hagen, Kristen; Nordahl, Håkon; Launes, Gunvor; Kvale, Gerd; Öst, Lars Gøran; Hystad, Sigurd. (2021) Does Concentrated Exposure Treatment for Obsessive-Compulsive Disorder Improve Insomnia Symptoms? Results From a Randomized Controlled Trial. Frontiers in Psychiatry
  Academic article

2017

• Nordahl, Håkon; Havnen, Audun; Hansen, Bjarne; Öst, Lars-Göran; Kvale, Gerd. (2017) Sleep disturbances in treatment-seeking OCD-patients: Changes after concentrated exposure treatment. Scandinavian Journal of Psychology
  Academic article

2014

• Nordahl, Håkon; Havnen, Audun; Hansen, Bjarne; Øst, Lars Gøran; Kvale, Gerd. (2014) Predictors of sleep disturbances in treatment-seeking OCD-patients. Clinical Neuropsychiatry
  Academic article