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Idiopathic hypersomnia without long sleep time is a sleep disorder characterized almost entirely by constant excessive daytime drowsiness lasting more than 3 months, with involuntary more or less restorative daytime naps. Night rest is of normal length or slightly prolonged but is less than 10 hours in duration, with often normal awakening.
Biomarker and diagnostic research for idiopathic hypersomnia without long sleep time has been reported in the published literature.
1 clinical trial registered, 1 recruiting. Interventions under study include other interventions. Research is primarily sponsored by academic and government institutions.
2 publications have been identified in PubMed for idiopathic hypersomnia without long sleep time. Research spans Diagnostic / Biomarker (50%) and Review / Meta-Analysis (50%).
Adam T (2025). [PMID: 39979124](https://pubmed.ncbi.nlm.nih.gov/39979124/). *J Sleep Res*. [Diagnostic / Biomarker]
Thorpy MJ (2024). [PMID: 38796978](https://pubmed.ncbi.nlm.nih.gov/38796978/). *Sleep Med*. [Review / Meta-Analysis]
Data assembled from 4 of 12 sources · Last updated Sep 18, 2026, 6:30 PM UTC
European rare disease database