Sleep Centers of Middle Tennessee


Idiopathic Hypersomnia

Idiopathic hypersomnia (IHS), like narcolepsy, is a disorder of severe daytime sleepiness. Whereas narcolepsy is often characterized by “pockets” of severe sleepiness (resulting in “sleep attacks”), IHS is usually characterized by severe daytime sleepiness that is relentless, occurring throughout the day. This disorder is given a specifier of “with long sleep time” if the patient meets criteria for IHS and is sleeping more than 10 hours per day, or “without long sleep time” if the patient does sleep for more than 10 hours per day. IHS usually has an onset during the late teen or early adulthood years, and often goes undiagnosed for years.  IHS is most often diagnosed with an overnight sleep study followed by a nap trial test (called a Multiple Sleep Latency Test) during the day.  The treatment for IHS is usually stimulant and other types of medication, in addition to behavioral treatments such as scheduling naps.

Click here to make an appointment to discuss IHS with a sleep doctor.