This subdivision has now been replaced by the ICSD-3, according to which Type 1 narcolepsy (NT1) is with hypocretin (also called orexin) deficiency and Type 2 narcolepsy (NT2) is without hypocretin deficiency, e.g. the absence of cataplexy. Here, HCRT is linked to hyperinsulinemic hypoglycemia, familial, 4.