Narcolepsy 2, also known as narcolepsy without cataplexy, is related to idiopathic hypersomnia and hypersomnia. An important gene associated with Narcolepsy 2 is NRCLP2 (Narcolepsy, HLA-Associated), and among its related pathways/superpathways are CD28 Signaling in T-Helper Cell and Immune response Function of MEF2 in T lymphocytes. The drugs Dopamine and Mazindol have been mentioned in the context of this disorder. Affiliated tissues include eye and temporal lobe, and related phenotypes are hallucinations and insomnia