We decided to 1) estimate the frequency of schizophrenia-like psychosis and its characteristics in patients with NT1 at two large European sleep disorder centers; and 2) measure the presence of IgG autoantibodies that detect the GluN1 NMDAR subunit in this subpopulation and compare it with a group of patients with NT1 without psychosis. This evidence concerns the gene GRIN1 and schizophrenia.