Idiopathic hypersomnia is sometimes regarded as the stepchild of narcolepsy. But it may be more common than its better known relation. In this podcast, we discussed the diagnosis and management of this elusive disorder. 0:00 – Welcome to Mayo Clinic Sleep Medicine Podcast 0:39 – What is idiopathic hypersomnia? 1:12 – Guest introduction: Dr. Maggie Blattner 1:27 – Is idiopathic hypersomnia a diagnosis of exclusion? 1:49 – Heterogeneity and clinical phenotypes of IH 3:19 – Diagnostic criteria and