Episodic hypersomnia

What it means

Recurrent episodes of hypersomnia (sleeping 16 or more hours a day) over a period of days or weeks.

This feature is characteristic of Kleine-Levin syndrome.

Rare diseases that can present with this1

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Idiopathic hypersomnia · Recurrent hypersomnia