hypersomnolence« Back to Glossary IndexHypersomnolence refers to the symptoms of long sleep and/or excessive daytime sleepiness. For more details, see Classification of Hypersomnias. Related Articles: In Case You Missed It! – January 2023Let’s Kick Off Giving Tuesday 2022 Together!In Case You Missed It! – October 2022In Case You Missed It! – September 2022Hypersomnia Foundation Hosted the Largest Patient-Centered Sleep Conference Ever This JuneNews From World Sleep 2022 in Rome!Guide for Sleep & Research Study CentersIn Case You Missed It! – October 2021Diagnosing Hypersomnias Differently—A European ProposalIn Case You Missed It! – September 2021Free Access to the Idiopathic Hypersomnia Severity ScaleVIRTUAL: Diagnosing Hypersomnia Differently—A European ProposalHealth and Prescription Medicine InsuranceIn Case You Missed It! – December 2020In Case You Missed It! – November 2020VIRTUAL: HF's The Research Continues2018 ConferenceJoin the International Patient RegistryClassification of HypersomniasAbout Related Sleep Disorders (Hypersomnias)