What it is
It is often caused by a lack of a brain chemical called hypocretin (orexin).
There is no cure, but planned naps, good sleep habits and medicines can reduce symptoms. Driving rules may apply.
Common signs
- Excessive daytime sleepiness
- Falling asleep suddenly
- Cataplexy: sudden weakness when laughing or surprised
- Sleep paralysis
- Vivid dreams when falling asleep or waking
How it is usually diagnosed
- Sleep diary
- Overnight sleep study
- Multiple sleep latency test
- Sometimes a lumbar puncture to measure hypocretin
Records worth keeping
Keeping these together makes each appointment easier, especially when you see a new doctor:
- Sleep study reports
- Sleepiness questionnaire scores
- Sleep clinic letters
- A list of medicines
Questions to ask your doctor
- Which treatment would suit me?
- Can I drive?
- What adjustments can I ask for at work or school?
When to get help right away
Call 112 or go to the nearest emergency department if you have:
- Falling asleep while driving: stop driving and seek advice
This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.