PWIH« Back to Glossary IndexPWIH is an acronym for person(s) with idiopathic hypersomnia. Related Articles: Guide to Survey DesignConsiderations for ProfessionalsSleep Hygiene and What It Means for People Who Have HypersomniasMedical Alert OptionsParticipating in Support Groups as a Person With Idiopathic HypersomniaTreatment for Idiopathic Hypersomnia & NarcolepsyGlossary: PWH