Hypersomnia Foundation

Idiopathic hypersomnia [IH]

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Idiopathic hypersomnia (IH) is a sleep disorder in which people are excessively sleepy during the day independent of sleep duration. People with IH often wake feeling unrefreshed even after sleeping for long periods of time. They also have difficulty waking to alarms or external stimuli and may experience sleep inertia (difficulty moving and thinking after abrupt awakening) or confusional arousal.

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