1. Department of Psychology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
2. Department of Child and Adolescent Psychiatry, St Olavs Hospital, Trondheim, Norway
3. NTNU Social Research, Human Development Department, Trondheim, Norway
4. Department of Psychosocial Science, University of Bergen, Bergen, Norway
5. Norwegian Competence Center for Sleep Disorders, Haukeland University Hospital, Bergen, Norway