[1] Univ Bergen, Dept Psychosocial Sci, POB 7807, N-5020 Bergen, Norway
[2] Innlandet Hosp Trust, KoRus Ost, Ottestad, Norway
[3] Univ Adelaide, Sch Psychol, Adelaide, SA, Australia
[4] Univ Bergen, Dept Global Publ Hlth & Primary Care, Bergen, Norway
[5] Haukeland Hosp, Norwegian Competence Ctr Sleep Disorders, Bergen, Norway
[6] Treatment Ctr Addict Disorder, Borgestad Clin, Skien, Norway