1. Department of Psychosocial Science, University of Bergen, Bergen, Norway
2. Norwegian Competence Center for Sleep Disorders, Haukeland University Hospital, Bergen, Norway
3. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
4. Department of Health Promotion, Norwegian Institute of Public Health, Bergen, Norway
5. Work Psychology & Physiology, The National Institute of Occupational Health, Oslo, Norway