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Idiopathic Hypersomnia
Excessive, persistent daytime sleepiness with no identifiable cause, often with long sleep and a difficult, confused waking.
It is rare - estimates around 10 cases per 100,000 people - and probably underestimated because of diagnostic difficulty.
It is a central disorder of hypersomnolence: the need to sleep stays high even after a full night, and waking comes with an intense, prolonged sleep inertia. It does not depend on sleeping too little.
The sleepiness is not recovered with more sleep, and the inertia weighs precisely in the first minutes after getting up - the moments when one often gets into the car. Diagnosis and treatment reduce that sleepiness.
It is one of the hypersomnias, the family in which sleep invades the day beyond the control of will. Drive Awake documents it because it shows, in clinical form, the limit of simply sleeping more.