What Is Narcolepsy? Symptoms, Types, Diagnosis and Management
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What is narcolepsy? It's a long-term neurological condition in which the brain can't keep sleep and wakefulness properly separated, so people feel overwhelmingly sleepy during the day and can fall asleep at the wrong moments. It's uncommon, often missed for years, and very different from the sleepy cartoon version. This guide covers what narcolepsy is, its main symptoms, the two types, what causes it, how it's diagnosed and managed, and when to see your GP.
The short answer: narcolepsy is a chronic brain condition whose main symptom is excessive daytime sleepiness, with an irresistible urge to sleep even after a normal night. Many people also have cataplexy (sudden muscle weakness set off by laughter or other strong emotions), sleep paralysis, vivid hallucinations as they fall asleep or wake, and broken night sleep. Type 1 is caused by the loss of brain cells that make a chemical called hypocretin (orexin). It's diagnosed by a sleep specialist with an overnight sleep study and a daytime nap test. There's no cure, but medicines, planned naps and a regular routine help many people manage well.
This guide is general information, not medical advice.
What narcolepsy is
The Sleep Health Foundation describes narcolepsy as a chronic neurological disorder marked by excessive daytime sleepiness and sudden, uncontrollable episodes of sleep. It affects about 4 in every 10,000 people worldwide, and men and women equally (source).
It usually starts in the teens or early adulthood, with the most common onset in the second decade of life and a second, smaller peak around age 40. It can begin at any age.
It's not the same as feeling tired after a bad week. People with narcolepsy can be sleepy despite a full night in bed. For the broader picture of sleepiness and its many causes, see excessive daytime sleepiness.
The main symptoms
Not everyone has all of these, and they can appear years apart.
- Excessive daytime sleepiness. The core symptom. The Sleep Health Foundation describes difficulty staying awake in passive situations, an irresistible urge to nap and falling asleep at inappropriate times.
- Cataplexy. Sudden muscle weakness triggered by strong emotion, often laughter. Episodes typically last up to a few minutes, and the person stays conscious throughout.
- Sleep paralysis. Being briefly unable to move as you fall asleep or wake up. Many people without narcolepsy have this occasionally; see sleep paralysis.
- Hallucinations. Vivid, dream-like experiences as you drift off (hypnagogic) or as you wake (hypnopompic).
- Disturbed night sleep. People often fall asleep quickly but wake many times through the night.
Type 1 and type 2
| Narcolepsy type 1 | Narcolepsy type 2 | |
|---|---|---|
| Daytime sleepiness | Yes | Yes |
| Cataplexy | Usually present | Absent |
| Diagnosed with | Sleep study and MSLT | Sleep study and MSLT |
The Sleep Health Foundation explains that narcolepsy type 1 results from the immune system destroying cells in a part of the brain called the lateral hypothalamus. Those cells make hypocretin, a chemical that keeps the switch between sleep and wake stable. The daytime nap test used in diagnosis also checks whether you slip quickly into REM sleep, the dreaming stage. Our guide to REM sleep explains that stage in more detail.
Why it's often missed
Narcolepsy can take years to diagnose. A study from 12 European countries of 580 people with type 1 narcolepsy found the median delay between first symptoms and diagnosis was about 5 years, and the average nearly 10. The researchers concluded that the best way to shorten the delay is to recognise cataplexy as early as possible (source).
Part of the problem is that the sleepiness gets put down to late nights, depression or laziness, and mild cataplexy is easy to overlook. If you or your child has unexplained, persistent sleepiness, especially with odd moments of weakness when laughing, mention both to your GP.
How it's diagnosed
Your GP will usually refer you to a sleep specialist. According to the Sleep Health Foundation, diagnosis normally involves:
- An overnight sleep study to check the quality of your night sleep and rule out other causes such as sleep apnoea.
- A Multiple Sleep Latency Test (MSLT) the next day: four or five nap opportunities spread through the day, measuring how quickly you fall asleep and whether you go into REM sleep.
Keeping a record of your sleep and symptoms for a couple of weeks beforehand helps.
How it's managed
There's no cure yet, but treatment can make a big difference. The Sleep Health Foundation lists wake-promoting medicines, scheduled naps, lifestyle changes, and some antidepressant medicines for cataplexy.
A practical guide to narcolepsy therapy in the journal Neurotherapeutics describes two or three short naps of 15 to 20 minutes at set times each day, together with a regular night-time sleep schedule. It notes that not every person benefits from short naps. In a patient survey it cites, 86% found daytime naps helpful and 76% found a scheduled night-time sleep helpful. It also recommends counselling and peer support groups (source). For nap length in general, see how long a power nap should be.
Driving. The Sleep Health Foundation stresses that driving must be restricted while symptoms are active. Your specialist will talk to you about fitness to drive and your licence obligations.
When to see your GP
See your GP if:
- you're very sleepy during the day despite enough sleep at night
- you fall asleep at unexpected times, such as mid-conversation or mid-meal
- your muscles go weak when you laugh, get angry or are surprised
- you often have sleep paralysis or hallucinations at the edges of sleep
- you've nodded off while driving.
Where the Sovune Nudge fits
We make the Sovune Nudge, a vibrating alarm wristband, so we're not neutral. A vibrating alarm is not a treatment for narcolepsy, and it can't stop sleep attacks. It's simply a quiet, wearable alarm some people use for their everyday wake-up times.
- Three separate alarms, set on the band itself, with no app or phone.
- Vibration on your wrist only, with no sound, so it won't disturb a classroom, office or partner.
- Starts as a gentle tap and builds through three intensity levels, over a full minute, and you can switch it off sooner.
- Under 20 grams, with a soft adjustable strap.
It comes with a 30-day money-back guarantee.
Quick answers
Is narcolepsy rare? It's uncommon. The Sleep Health Foundation puts it at about 4 in every 10,000 people.
Do people with narcolepsy just fall asleep suddenly? Sometimes, but the main symptom is constant, heavy sleepiness. Sudden collapses are usually cataplexy, in which the person stays awake but loses muscle tone.
Can narcolepsy be cured? Not yet. Medicines, planned naps and a regular sleep routine help many people manage it.
Can a vibrating alarm help narcolepsy? No. A vibrating alarm is not a treatment. Diagnosis and management belong with a sleep specialist.
For every type of silent alarm compared, see our complete guide to vibrating alarms in Australia.