Idiopathic Hypersomnia, also known as idiopathic excessive sleepiness, is related to hypersomnia and narcolepsy. An important gene associated with Idiopathic Hypersomnia is HCRT (Hypocretin Neuropeptide Precursor). The drugs Modafinil and Fluticasone have been mentioned in the context of this disorder. Affiliated tissues include brain and heart, and related phenotypes are hypersomnia and excessive daytime somnolence