Alessandro Silvani1, Mauro Manconi2,3, Raffaele Ferri4. 1. Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy. 2. Sleep and Epilepsy Center, Neurocenter of Southern Switzerland, Civic Hospital (EOC) of Lugano, Lugano, Switzerland. 3. Department of Neurology, Bern University Hospital, Bern, Switzerland. 4. Sleep Research Centre, Department of Neurology I.C., Oasi Institute for Research on Mental Retardation and Brain Aging (IRCCS), Troina, Italy.