(See also Approach to the Patient With a Sleep or Wakefulness Disorder Approach to the Patient With a Sleep or Wakefulness Disorder Almost half of all people in the US report sleep-related problems. Disordered sleep can cause emotional disturbance, memory difficulty, poor motor skills, decreased work efficiency, and increased... read more .)
Idiopathic hypersomnia is not well-characterized. Cause is presumed to be dysfunction of the central nervous system.
Excessive daytime sleepiness is the main symptom; sleep time may or may not be prolonged.
In idiopathic hypersomnia with a long sleep time, the history or sleep logs indicate > 10 hours of nocturnal sleep; in idiopathic hypersomnia without a long sleep time, it is > 6 hours but < 10 hours. In both cases, polysomnography shows no evidence of other sleep abnormalities. Multiple sleep latency testing shows short sleep latencies (< 8 minutes) with fewer than 2 REM periods.
Treatment of idiopathic hyperinsomnia is similar to that of narcolepsy Treatment Narcolepsy is characterized by chronic excessive daytime sleepiness, often with sudden loss of muscle tone (cataplexy). Other symptoms include sleep paralysis and hypnagogic and hypnopompic... read more (eg, modafinil), except that anticataplectic drugs are unnecessary.
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