Narcolepsy Diagnosis: Understanding the Disorder


Narcolepsy is a chronic neurological disorder that is characterised by excessive daytime sleepiness and sudden episodes of falling asleep during the daytime, usually when engaged in activities such as eating, working or driving. In addition to excessive daytime sleepiness, other symptoms of narcolepsy include sleep paralysis, hallucinations, and cataplexy (sudden loss of muscle tone). While narcolepsy can significantly affect an individual’s quality of life, it is not life-threatening. Nonetheless, early diagnosis and treatment are crucial for reducing the severity of its symptoms.

Diagnosing Narcolepsy

Narcolepsy is a relatively rare disorder, and its diagnosis can be challenging since its symptoms can be similar to other sleep disorders such as sleep apnoea or restless leg syndrome. Various diagnostic tools and tests are used to diagnose narcolepsy, which can include:

1. Medical History and Physical Exam

During the physical examination, the healthcare provider will inquire about the patient’s symptoms, medical history, and possible causes of their excessive daytime sleepiness. They may also conduct a physical examination and assess the patient’s neurological health to rule out other possible causes such as thyroid problems, depression, or anxiety.

2. Sleep Study

A polysomnogram, also known as a sleep study, is a diagnostic tool that measures an individual’s brain activity, eye movements, and muscle activity during sleep. It allows the healthcare provider to observe the patient’s sleep patterns and determine if they have any underlying sleep disorders such as sleep apnoea. The sleep study also includes a multiple sleep latency test (MSLT), which assesses the patient’s ability to fall asleep during the daytime.

3. HLA Typing Blood Test

Human leukocyte antigen (HLA) typing blood test is a genetic test used to determine the individual’s genetic markers. The test can help identify the presence of certain genes associated with narcolepsy. In particular, a gene called HLA-DQB1*0602 has been found to be present in up to 98% of people with narcolepsy.

Treatment Options for Narcolepsy

While there is currently no cure for narcolepsy, treatment options are available to manage its symptoms. The primary focus of narcolepsy treatment is to help individuals manage their excessive daytime sleepiness and cataplexy episodes, allowing them to carry out their daily activities without any hindrances. Treatment options for narcolepsy can include:

1. Medications

Various medications are available that can help manage the symptoms of narcolepsy. Stimulants such as modafinil, armodafinil, and methylphenidate are commonly used to combat excessive daytime sleepiness. Other medications such as sodium oxybate can help manage cataplexy episodes.

2. Lifestyle Changes

There are various lifestyle changes that individuals with narcolepsy can adopt to help manage their symptoms. These can include establishing a regular sleep routine, avoiding caffeine and alcohol, and maintaining a healthy diet and exercise regimen.

3. Sleep Hygiene

Good sleep hygiene practices such as taking regular breaks during work, avoiding night-time meals, and creating a comfortable sleep environment can also help individuals with narcolepsy manage their symptoms.


Narcolepsy is a chronic sleep disorder characterised by excessive daytime sleepiness and sudden episodes of falling asleep during the daytime. Its diagnosis can be challenging due to its symptoms, which can be mistaken for those of other sleep disorders. However, with accurate diagnostic tools, narcolepsy can be identified, and its symptoms can be managed using a combination of medication and lifestyle changes. It’s essential to seek medical attention if you suspect you may be experiencing symptoms of narcolepsy, as it can significantly affect your quality of life if left untreated.


What are the common symptoms of narcolepsy?

The most common symptoms of narcolepsy are excessive daytime sleepiness, sudden loss of muscle tone (cataplexy), hallucinations and sleep paralysis. These symptoms can significantly impact daily life and require diagnosis and treatment by a healthcare professional.

How is narcolepsy diagnosed?

Narcolepsy is typically diagnosed through a combination of patient history, physical examination, and sleep studies. A healthcare professional may conduct a Multiple Sleep Latency Test (MSLT) or Polysomnogram (PSG) to measure the patient’s sleep patterns and determine if they have narcolepsy.

What treatments are available for narcolepsy?

There is no cure for narcolepsy, but symptoms can be managed with medication and lifestyle adjustments. Stimulants such as modafinil and armodafinil are commonly prescribed to help manage excessive daytime sleepiness. Antidepressants and sodium oxybate may also be used to treat cataplexy and other symptoms of narcolepsy. It’s important for patients to work closely with their healthcare provider to develop a personalized treatment plan.


1. Huang, Y. S., & Guilleminault, C. (2014). Narcolepsy: Diagnosis and management. Current Treatment Options in Neurology, 16(7), 303. doi:10.1007/s11940-014-0303-4

2. Mignot, E. J., & Lin, L. (2017). Narcolepsy: A clinical guide. Current Opinion in Pulmonary Medicine, 23(6), 522-530. doi:10.1097/MCP.0000000000000411

3. Scammell, T. E. (2015). Narcolepsy. New England Journal of Medicine, 373(27), 2654-2662. doi:10.1056/NEJMra1500587