1 Norwegian Centre of Expertise for Neurodevelopmental Disorders and Hypersomnias (NevSom), Department of Rare Disorders (R.V., S.K.), Department of Neurology, Section for Clinical Neurophysiology (R.V., K.B.N.), Department of Child Neurology (J.S., T.V.), Oslo University Hospital, Ullevål, Norway; Hormone Laboratory, Department of Medical Biochemistry (P.M.T.), Oslo University Hospital, Aker, Norway; Department of Neuromedicine and Movement Science (K.B.N.), Norwegian University of Science and Technology, Trondheim, Norway; and Medical Faculty (R.V.), University of Oslo, Norway.