Fiducia TogetherNarcolepsy
The brain cannot hold the boundary between sleep and waking. Diagnosed on average a decade late.
Important: This page is general information, not medical advice, and it is not a diagnosis. If you are worried about your health or someone else's, speak to a GP, pharmacist, or call 111. In an emergency, call 999.
What it is
Narcolepsy is caused, in most cases, by the loss of hypocretin-producing neurones in the brain: the cells that keep wakefulness stable. Without them, sleep intrudes into the day and waking intrudes into the night.
Around 25,000 people in the UK have it. The average delay to diagnosis is roughly ten years, and in that time people are commonly treated for depression, for laziness, or for nothing.
Type 1 includes cataplexy, sudden loss of muscle tone triggered by strong emotion, usually laughter. Type 2 does not.
Signs you might notice
Overwhelming daytime sleepiness, with sleep attacks that cannot be resisted.
Cataplexy: knees buckling, jaw dropping, or collapse, while fully conscious, triggered by laughing or surprise. It is often mistaken for fainting or for seizures.
Sleep paralysis on waking or falling asleep.
Vivid hallucinations at the edges of sleep, which are frequently frightening and frequently misinterpreted as psychosis.
Disrupted night-time sleep, which surprises people who assume narcolepsy means sleeping well.
How it can affect day-to-day life
Being labelled lazy for a decade does the same damage here as it does in ADHD, and for the same reason: the symptom looks like a choice.
School and work are where it bites. Falling asleep in lessons gets punished. Driving is affected and must be declared to the DVLA.
Cataplexy makes people avoid laughing, which is a peculiar and quietly sad way to have to live.
Supporting someone well
Build in scheduled short naps. Two or three planned 15-minute naps are genuinely effective and are treated as an adjustment, not as an indulgence.
Keep a fixed sleep schedule, including weekends.
Explain cataplexy to schools and employers in writing, because it is alarming to watch and easily misread.
Support the DVLA declaration rather than avoiding it, and know that many people drive legally once treated.
Ask for a proper sleep study. This diagnosis needs polysomnography and a multiple sleep latency test, not an opinion.
Where to get help
Ask a GP for referral to a sleep clinic or neurologist.
Narcolepsy UK provide support and school and workplace resources.
If the sleepiness came on after a vaccination or infection, mention it: onset history helps the diagnosis.
Where to read more
Last reviewed 2026-08-28 by Fiducia Together · Next review due 2027-08-28
Important: This page is general information, not medical advice, and it is not a diagnosis. If you are worried about your health or someone else's, speak to a GP, pharmacist, or call 111. In an emergency, call 999.