Raphael Heinzer1, Danny Eckert2. 1. Center for Investigation and Research in Sleep, University Hospital of Lausanne (CHUV), 1011 Lausanne, Switzerland; Pulmonary Department, CHUV, Lausanne, Switzerland. Electronic address: raphael.heinzer@chuv.ch. 2. Adelaide Institute for Sleep Health, Flinders University, Bedford Park, SA, Australia.