Narcolepsy

Diagnosis

Your health care provider may suspect narcolepsy based on your symptoms of excessive daytime sleepiness and sudden loss of muscle tone, known as cataplexy. Your provider will likely refer you to a sleep specialist. Formal diagnosis requires staying overnight at a sleep center for an in-depth sleep analysis.

A sleep specialist will likely diagnose narcolepsy and determine how severe it is based on:

• Your sleep history. A detailed sleep history can help with a diagnosis. You'll likely fill out the Epworth Sleepiness Scale. The scale uses short questions to measure your degree of sleepiness. You'll answer how likely it is that you would fall asleep in certain times, such as sitting down after lunch.

• Your sleep records. You may be asked to write down your sleep pattern for a week or two. This allows your provider to compare how your sleep pattern may relate to how alert you feel.

  Your health care provider also may ask you to wear an actigraph. This device is worn like a watch. It measures periods of activity and rest. It provides an indirect measure of how and when you sleep.

• A sleep study, known as polysomnography. This test measures signals during sleep using flat metal discs called electrodes placed on your scalp. For this test, you must spend a night at a medical facility. The test measures your brain waves, heart rate and breathing. It also records your leg and eye movements.
• Multiple sleep latency test. This test measures how long it takes you to fall asleep during the day. You'll be asked to take four or five naps at a sleep center. Each nap needs to be two hours apart. Specialists will observe your sleep patterns. People who have narcolepsy fall asleep easily and enter into rapid eye movement (REM) sleep quickly.
• Genetic tests and a lumbar puncture, known as a spinal tap. Occasionally, a genetic test may be performed to see if you're at risk of type 1 narcolepsy. If so, your sleep specialist may recommend a lumbar puncture to check the level of hypocretin in your spinal fluid. This test is only done in specialized centers.

These tests also can help rule out other possible causes of your symptoms. Excessive daytime sleepiness could also be caused by sleep deprivation, the use of sedating medicines and sleep apnea.

Treatment

There is no cure for narcolepsy, but medicines and lifestyle changes can help you manage the symptoms.

Medications

Medicines for narcolepsy include:

• Stimulants. Drugs that stimulate the central nervous system are the primary treatment to help people with narcolepsy stay awake during the day. Your health care provider may recommend modafinil (Provigil) or armodafinil (Nuvigil). These medicines aren't as habit-forming as older stimulants. They also don't produce the highs and lows associated with older stimulants. Side effects are uncommon but may include headache, nausea or anxiety.

  Solriamfetol (Sunosi) and pitolisant (Wakix) are newer stimulants used for narcolepsy. Pitolisant also may be helpful for cataplexy.

  Some people need treatment with methylphenidate (Ritalin, Concerta, others) or amphetamines (Adderall XR 10, Dexedrine, others). These medicines are effective but can be habit-forming. They may cause side effects such as nervousness and a fast heartbeat.

• Serotonin and norepinephrine reuptake inhibitors (SNRIs) or selective serotonin reuptake inhibitors (SSRIs). These medicines suppress REM sleep. Health care providers prescribe these medicines to help ease the symptoms of cataplexy, hallucinations and sleep paralysis.

  They include venlafaxine (Effexor XR), fluoxetine (Prozac) and sertraline (Zoloft). Side effects can include weight gain, insomnia and digestive problems.

• Tricyclic antidepressants. These older antidepressants can treat cataplexy. But they can cause side effects such as dry mouth and lightheadedness. These medicines include protriptyline, imipramine (Tofranil) and clomipramine (Anafranil).

• Sodium oxybate (Xyrem) and oxybate salts (Xywav). These medicines work well at relieving cataplexy. They help improve nighttime sleep, which is often poor in narcolepsy. They also may help control daytime sleepiness. It's taken in two doses, one at bedtime and one up to four hours later.

  Xywav is a newer formulation with less sodium.

  These medicines can have side effects, such as nausea, bed-wetting and sleepwalking. Taking them together with other sleeping tablets, narcotic pain relievers or alcohol can lead to trouble breathing, coma and death.

If you take medicines for other health problems, ask your health care provider how they may interact with narcolepsy medicines.

Certain medicines that you can buy without a prescription can cause drowsiness. They include allergy and cold medicines. If you have narcolepsy, your doctor may recommend that you don't take these medicines.

Researchers are studying other potential treatments for narcolepsy. Medicines being studied include those that target the hypocretin chemical system. Researchers also are studying immunotherapy. Further research is needed before these medicines become available.

Clinical trials

Explore Mayo Clinic studies testing new treatments, interventions and tests as a means to prevent, detect, treat or manage this condition.

Lifestyle and home remedies

Lifestyle changes are important in managing the symptoms of narcolepsy. You may benefit if you:

• Stick to a schedule. Go to sleep and wake up at the same time every day, including weekends.
• Take naps. Schedule short naps at regular intervals during the day. Naps of 20 minutes during the day may be refreshing. They also may reduce sleepiness for 1 to 3 hours. Some people may need longer naps.
• Avoid nicotine and alcohol. Using these substances, especially at night, can worsen your symptoms.
• Get regular exercise. Plan for moderate, regular exercise at least 4 to 5 hours before bedtime. It may help you sleep better at night and feel more awake during the day.

Coping and support

Dealing with narcolepsy can be a challenge. Consider these tips:

• Talk about it. Tell your employer or teachers about your condition. Then work with them to find ways to adjust to your needs. This may include taking naps during the day. Or you might break up repetitive tasks. You might record meetings or classes to refer to later. You also might find it helps to stand during meetings or lectures, and to take brisk walks during the day.

  The Americans with Disabilities Act prohibits discrimination against workers with narcolepsy. Employers are required to provide reasonable accommodation to qualified employees.

• Be safe while driving. If you must drive a long distance, work with your health care provider to find ways to make a safe trip. Create a medicine schedule that is most likely to keep you awake during your drive. Stop for naps and exercise breaks whenever you feel drowsy. Don't drive if you feel too sleepy.

Support groups and counseling can help you and your loved ones cope with narcolepsy. Ask your health care provider to help you locate a group or qualified counselor in your area.

Preparing for your appointment

You're likely to start by seeing your primary care provider. But if narcolepsy is suspected, you may be referred to a sleep specialist.

Here's some information to help you prepare for your appointment.

What you can do

• Be aware of any pre-appointment restrictions. At the time you make the appointment, be sure to ask if there's anything you need to do in advance.
• Write down any symptoms you're experiencing, including any that may seem unrelated to the reason for which you scheduled the appointment.
• Write down key personal information, including any major stresses or recent life changes.
• Make a list of all medicines, vitamins or supplements you're taking.
• Ask a family member or friend to go with you. Sometimes it can be difficult to recall all the information you get during an appointment. Someone who accompanies you may remember something that you missed or forgot.
• Write down questions to ask your health care provider.

Preparing a list of questions for your provider will help you make the most of your time together. List your questions from most important to least important. For narcolepsy, some basic questions to ask your doctor include:

• What's the most likely cause of my symptoms?
• Are there other possible causes?
• What kinds of tests do I need?
• Do I need a sleep study?
• Is my condition likely temporary or long lasting?
• What treatment do you recommend?
• What are the alternatives to the primary approach you're suggesting?
• I have these other health conditions. How can I best manage these conditions together?
• Is there a generic alternative to the medicine you're prescribing?
• Are there any brochures or other printed material that I can take home with me? What websites do you recommend?

Don't hesitate to ask other questions anytime during your appointment.

What to expect from your doctor

Your doctor is likely to ask you a number of questions, including:

• When did you begin experiencing symptoms?
• Have your symptoms been continuous or occasional?
• How often do you fall asleep during the day?
• How severe are your symptoms?
• Does anything improve your symptoms?
• What, if anything, appears to worsen your symptoms?
• Does anyone in your family have similar symptoms?