Idiopathic hypersomnia (IH) is a rare and poorly studied disease characterized by excessive daytime sleepiness different from that of narcolepsy (sleep drunkness non-recuperative naps and nocturnal blackout). Local sleep is a recent concept, proposing a local regulation of the sleep-wake state, characterized by slow waves (SW) restricted to certain regions of a globally awake brain. The investigators are going to investigate whether local sleep could explain the sleepiness of these patients better than the global occurrence of sleep which are not very frequent during daytime tests in IH. The investigators propose to look for local sleep through the detection of local slow waves in the EEG of resting wakefulness and during an attentional task in people with IH compared to people with NT1 (sleepy, but with a different type of sleepiness from IH, more abrupt and including REM sleep) and non sleepy people.
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local sleep topography
Timeframe: At enrollment visit