1 Center for Biomedical Education and Research (ZBAF), Faculty of Health, University Witten/Herdecke, Witten, Germany; Clinical Sleep and Neuroimmunology, Institute of Immunology, University Witten/Herdecke, Witten, Germany; Sleep Wake Centre ORFEA, Witten, Germany. Electronic address: ulf.kallweit@uni-wh.de.
2 Dept. of Respiratory Medicine, Ghent University Hospital, Gent, Belgium; Dept. of Internal Medicine and Paediatrics, Faculty of Medicine and Health Sciences, Ghent University, Gent, Belgium.
3 Leiden University Medical Centre, Department of Neurology, Leiden, the Netherlands; Sleep Wake Centre, Stichting Epilepsie Instellingen Nederland (SEIN), Heemstede, the Netherlands.