1. Technical University of Denmark, Kongens Lyngby, Denmark
2. Department of Health Technology, Technical University of Denmark, Kongens Lyngby, Denmark
3. Center for Sleep Sciences and Medicine, Stanford University, Palo Alto, CA, USA
4. Department of Psychiatry and Behavioural Sciences, Stanford University, Palo Alto, CA, USA
5. Department of Clinical Neurophysiology, Danish Center for Sleep Medicine, Rigshospitalet, Denmark