Daniel Neu1,2,3, Olivier Mairesse1,4,5, Olivier Le Bon6. 1. Sleep Laboratory and Unit for Chronobiology U78, Brugmann University Hospital, Université Libre de Bruxelles (U.L.B.), Brussels, Belgium. 2. UNI Neuroscience Institute, ULB312 Faculty of Medicine, and ULB388 Faculty of Motor Sciences, Université Libre de Bruxelles (U.L.B.), Brussels, Belgium. 3. Center for the Study of Sleep Disorders, Department of Internal Medicine, Edith Cavell Medical Institute, CHIREC, Brussels, Belgium. 4. Department EXTO, Vrije Universiteit Brussel (V.U.B.), Brussels, Belgium. 5. Royal Military Academy, Department LIFE, Brussels, Belgium. 6. Department of Psychiatry, Centre Hospitalier de Tivoli, U.L.B., La Louvière, Belgium.