Idiopathic hypersomnia is a central disorder of hypersomnolence. Learn about persistent sleepiness, sleep inertia and the specialist diagnostic pathway.
Medical information reviewed in the context of the Sleep Lab by Dr Omar Laraqui Hossini. This page is educational and does not replace an individual medical assessment.
Idiopathic hypersomnia is a sleep disorder characterised by persistent excessive sleepiness that is not better explained by insufficient sleep or another condition. Some people also report long sleep duration and marked difficulty waking.
A prominent feature can be severe sleep inertia: prolonged grogginess, confusion or difficulty becoming fully alert after waking. Naps may be long and may not feel refreshing.
Idiopathic hypersomnia and narcolepsy can overlap in the symptom of daytime sleepiness, but their clinical patterns and sleep-test findings differ. Cataplexy points strongly toward narcolepsy type 1 rather than idiopathic hypersomnia.
A specialist considers sleep duration, schedule, medicines, other sleep disorders and medical causes. Objective sleep testing may be recommended as part of the diagnostic process.
If you are concerned about narcolepsy, hypersomnia or persistent daytime sleepiness, you can begin with an online consultation. Testing in Casablanca is arranged only when clinically indicated.
For emergencies or urgent symptoms, contact local emergency or medical services rather than using the online appointment form.