Narcolepsy is a chronic neurological disorder affecting sleep-wake regulation. Narcolepsy causes excessive daytime sleepiness and other sleep abnormalities. Often underdiagnosed; average diagnostic delay is 10+ years.
Core symptoms
- Excessive daytime sleepiness (always present)
- Cataplexy (sudden muscle weakness with emotion) — type 1
- Sleep paralysis
- Hypnagogic hallucinations (vivid imagery falling asleep)
- Disrupted nighttime sleep
- Sleep attacks (involuntary sleep)
Type 1 vs Type 2
Type 1 (with cataplexy):
- Cataplexy present
- Hypocretin/orexin deficiency
- Likely autoimmune cause
- Often associated with HLA-DQB1*06:02
Type 2 (without cataplexy):
- No cataplexy
- Often less severe
- Diagnosis based on excessive sleepiness and abnormal sleep studies
Diagnosis
- Polysomnogram (rule out OSA)
- Multiple Sleep Latency Test (MSLT) the next day
- Mean sleep latency under 8 minutes
- Sleep-onset REM in 2+ naps
- CSF hypocretin testing in some cases
Treatment
For sleepiness:
- Modafinil (Provigil), armodafinil (Nuvigil) — first line
- Stimulants (methylphenidate, amphetamines)
- Solriamfetol (Sunosi)
- Pitolisant (Wakix)
For cataplexy:
- Sodium oxybate (Xyrem) or low-sodium oxybate (Xywav)
- SSRIs/SNRIs
- Pitolisant
Behavioral:
- Strategic scheduled naps
- Adequate nighttime sleep
- Consistent schedule
Quality of life impact
Significant. Driving safety, work, social life affected. Disability accommodations often warranted.
Frequently Asked Questions
How is narcolepsy different from being tired?
Severe daytime sleepiness with sleep attacks. Specific abnormalities on sleep testing.
Can narcolepsy be cured?
No cure; effective management possible.
What’s cataplexy?
Sudden muscle weakness triggered by strong emotion (often laughter). Diagnostic of type 1.
Is narcolepsy genetic?
Genetic predisposition exists. Specific HLA genotype common in type 1.
Can children have narcolepsy?
Yes. Often misdiagnosed as ADHD or behavioral issues.
The bottom line on narcolepsy
Chronic neurological disorder. Often underdiagnosed. Multiple effective treatments. Sleep specialist evaluation important for suspected cases.