diagnostic criteria
Last reviewed 01/2018
There are two approaches to diagnosis:
- both of the following:
- almost daily daytime sleep episodes for 3 months
- cataplexy
- all four of the following:
- excessive daytime sleepiness or sudden muscle weakness
- any of:
- sleep paralysis
- hypnagogic hallucinations
- automatic behaviour
- disrupted nocturnal sleep episodes
- any of the following polysomnographic features:
- nocturnal sleep latency less than 10 min
- nocturnal REM sleep latency less than 20 min
- mean sleep latency less than 8 min on the multiple sleep latency test (MSLT)
- two or more sleep onset REM periods during MSLT
- exclusion of medical or psychiatric causation