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Idiopathic hypersomnia is a sleep disorder without a clear cause, in which you are excessively sleepy (hypersomnia) during the day. It is different from narcolepsy, because idiopathic hypersomnia does not involve suddenly falling asleep or losing muscle control due to strong emotions (cataplexy).
Hypersomnia - idiopathic; Drowsiness - idiopathic; Somnolence - idiopathic
The usual approach is to consider other potential causes of excessive daytime sleepiness.
Other sleep disorders that may cause daytime sleepiness include:
Other causes of excessive sleepiness include:
Symptoms often develop slowly during adolescence or young adulthood. They include:
Other symptoms may include:
Cataplexy -- suddenly falling asleep or losing muscle control -- which is part of narcolepsy, is not a symptom of idiopathic hypersomnia.
The health care provider will take a detailed sleep history. Tests may include:
A psychiatric evaluation for atypical depression may also be done.
Idiopathic hypersomnia is usually treated with stimulant medications such as amphetamine, methylphenidate, and modafinil. These medicines may not work as well for this condition as they do for narcolepsy.
Lifestyle changes that can help ease symptoms and prevent injury include:
Chokroverty S, Avidan AY. Sleep and its disorders. In: Daroff RB, Fenichel GM, Jankovic J, Mazziotta JC, eds. Bradley's Neurology in Clinical Practice. 6th ed. Philadelphia, PA: Elsevier Saunders; 2012:chap 68.
Masri TJ, Gonzales CG, Kushida CA. Idiopathic hypersomnia. Sleep Med Clin. 2012;7:283-289.