What Is Idiopathic Hypersomnia?

Idiopathic hypersomnia (IH) is a rare disorder in which an individual feels excessively sleepy, even after a full night of sleep. Individuals with IH may also still feel groggy or sleepy after waking up from a nap. This inability to feel refreshed can lead to excessive daytime sleepiness. Another symptom of IH is “sleep drunkenness,” marked by a massive difficulty awakening from sleep, with feelings of disorientation when waking. Currently, the cause of IH is unknown.^Footnote1

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