1. Sleep Disorders Center, Department of General and Specialized Medicine, University Hospital of Parma, 43125 Parma, Italy
2. Neurology Unit, Department of Medicine and Surgery, University of Parma, 43125 Parma, Italy
3. Plasticity Centre, Department of Neuroimaging, Institute of Psychiatry, Psychology and Neuroscience (IoPPN), King’s College London, London WC2R 2LS, UK