Read about hypersomnia sleep disorders
such as idiopathic hypersomnia, narcolepsy types 1 and 2, and Kleine-Levin syndrome
All hypersomnia sleep disorders have the same main symptom — excessive daytime sleepiness (EDS). EDS is a strong daytime sleepiness or need to sleep during the day, even with enough sleep the night before. However, each hypersomnia has unique challenges.
Idiopathic hypersomnia
On this page you’ll read about idiopathic hypersomnia (IH), including:
- The main IH symptoms and when they first happen in most people
- The challenges people with IH face
- How doctors diagnose IH
Narcolepsy type 2 (without cataplexy)
On this page you’ll read about narcolepsy type 2 (NT2), including:
- How NT2 is similar to idiopathic hypersomnia (IH) in some ways and to narcolepsy type 1 (NT1) in other ways
- The main NT2 symptoms and when they first happen in most people
- The challenges people with NT2 face
- How doctors diagnose NT2
Narcolepsy type 1 (with cataplexy)
On this page you’ll read about narcolepsy type (NT1), including:
- The main NT1 symptoms and when they first happen in most people
- The challenges people with NT1 face
- How doctors diagnose NT1
Compare the symptoms of idiopathic hypersomnia and narcolepsy types 1 and 2
Find our table showing how common the symptoms are in each of these disorders.
Kleine-Levin syndrome (including menstrual-related hypersomnia)
On this page you’ll read about Kleine-Levin syndrome, including:
- The main KLS symptoms and when they first happen in most people
- The challenges people with KLS face
- How doctors diagnose KLS
Hypersomnia and narcolepsy associated with other disorders
Sleep problems such as excessive daytime sleepiness and sleeping for 9 to 12 hours or more can be associated with many different health conditions. On this page you’ll find resources and a list of these health conditions.
Glossary
Health terms can be hard to understand, and it can be helpful to learn the meaning of terms that you'll run into when reading and talking about hypersomnia sleep disorders. Find plain language definitions you’ll want to know if you’re living with a hypersomnia sleep disorder or supporting someone who does.