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Symptoms of narcolepsy may worsen for the first few years, and then continue for life. They include:

• Excessive daytime sleepiness. The primary characteristics of narcolepsy are overwhelming drowsiness and an uncontrollable need to sleep during the day. People with narcolepsy fall asleep without warning, anywhere, anytime. For example, you may suddenly nod off while working or talking with friends. You may sleep for a few minutes or up to a half-hour before awakening and feeling refreshed, but eventually you fall asleep again. You also may experience decreased alertness throughout the day. Excessive daytime sleepiness usually is the first symptom to appear and is often the most troublesome, making it difficult for you to concentrate and function fully.
• Sudden loss of muscle tone. This condition, called cataplexy, can cause a number of physical changes, from slurred speech to complete weakness of most muscles, and may last for a few seconds to a few minutes. Cataplexy is uncontrollable and is often triggered by intense emotions, usually positive ones such as laughter or excitement, but sometimes fear, surprise or anger. For example, your head may droop uncontrollably or your knees may suddenly buckle when you laugh. Some people with narcolepsy experience only one or two episodes of cataplexy a year, while others have numerous episodes daily.
• Sleep paralysis. People with narcolepsy often experience a temporary inability to move or speak while falling asleep or upon waking. These episodes are usually brief — lasting one or two minutes — but can be frightening. You may be aware of the condition and have no difficulty recalling it afterward, even if you had no control over what was happening to you. This sleep paralysis mimics the type of temporary paralysis that normally occurs during rapid eye movement (REM) sleep, the period of sleep during which most dreaming occurs. This temporary immobility during REM sleep may prevent your body from acting out dream activity. Not everyone with sleep paralysis has narcolepsy, however. Many people without narcolepsy experience some episodes of sleep paralysis, especially in young adulthood.
• Hallucinations. These hallucinations, called hypnagogic hallucinations, may occur when falling quickly into REM sleep, as you do when you first fall asleep, or upon waking. Because you may be semiawake when you begin dreaming, you experience your dreams as reality, and they may be particularly vivid and frightening.

Other characteristics
People with narcolepsy may have other sleep disorders, such as obstructive sleep apnea, in which breathing starts and stops throughout the night, restless legs syndrome and even insomnia. People with narcolepsy may also act out their dreams at night by flailing their arms or kicking and screaming.

Some episodes of sleep attacks are brief, lasting seconds. Some people with narcolepsy experience automatic behavior during these brief episodes. For example, you may fall asleep while performing a task you normally perform, such as writing, typing or driving, and you continue to function while asleep. When you awaken, you can't remember what you did, and you probably didn't do it well. For instance, if you were writing, what you wrote asleep may look like scribbling.

The signs and symptoms of narcolepsy can begin anytime up to your 50s, but they most commonly begin between the ages of 10 and 25. Symptoms often are more severe for those who develop them early in life, rather than in adulthood.

When to see a doctor
See your doctor if you experience excessive daytime sleepiness that disrupts your personal or professional life.

©1998-2012 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.
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The exact cause of narcolepsy isn't known. Genetics may play a role. Other factors, such as infection, stress or exposure to toxins, may contribute to the development of narcolepsy.

Normal sleep pattern vs. narcolepsy
The normal process of falling asleep begins with a phase called non-rapid eye movement (NREM) sleep. During this phase, your brain waves slow considerably. After an hour or two of NREM sleep, your brain activity picks up again, and REM sleep begins. Most dreaming occurs during REM sleep.

In narcolepsy, however, you may suddenly enter into REM sleep without first experiencing NREM sleep, both at night and during the day. Some of the characteristics of REM sleep, such as sudden lack of muscle tone, sleep paralysis and vivid dreams, occur during other sleep stages in people with narcolepsy.

The role of brain chemicals
Hypocretin is an important chemical in your brain that helps regulate wakefulness and REM sleep. People with narcolepsy have low levels of this neurochemical in their spinal fluid. It's particularly low in those who experience cataplexy. Exactly what causes the loss of hypocretin-producing cells in the brain isn't known, but experts suspect it's due to an autoimmune reaction.

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Public misunderstanding of the condition
Narcolepsy may cause serious problems for you professionally and personally. Others might see you as lazy, lethargic or rude. Your performance may suffer at school or work.

Interference with intimate relationships
Extreme sleepiness may cause low sex drive or impotence, and people with narcolepsy may even fall asleep while having sex. The problems caused by sexual dysfunction can be further complicated by emotional difficulties. Intense feelings, such as anger or joy, can trigger some signs of narcolepsy such as cataplexy, causing affected people to withdraw from emotional interactions.

Physical harm
Sleep attacks may result in physical harm to people with narcolepsy. You're at increased risk of a car accident if you have an attack while driving. Your risk of cuts and burns is greater if you fall asleep while preparing food.

©1998-2012 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.
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You're likely to start by seeing your family doctor or a general practitioner. However, in some cases when you call to set up an appointment, you may be referred immediately 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 medications, vitamins or supplements you're taking.
• Ask a family member or friend to go with you. Sometimes it can be difficult to soak up 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 doctor.

Preparing a list of questions for your doctor 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 is likely causing my symptoms or condition?
• Other than the most likely cause, what are other possible causes for my symptoms or condition?
• What kinds of tests do I need?
• Do I need a sleep study?
• Is my condition likely temporary or chronic?
• What is the best course of action?
• What are the alternatives to the primary approach you're suggesting?
• I have these other health conditions. How can I best manage them together?
• Are there any restrictions that I need to follow?
• 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?
• What, if anything, seems to improve your symptoms?
• What, if anything, appears to worsen your symptoms?

©1998-2012 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.
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Your doctor may make a preliminary diagnosis of narcolepsy based on your excessive daytime sleepiness and sudden loss of muscle tone (cataplexy). After an initial diagnosis, your doctor may refer you to a sleep specialist for more evaluation.

Formal diagnosis may require staying overnight at a sleep center, where you undergo an in-depth analysis of your sleep by a team of specialists. Methods of diagnosing narcolepsy and determining its severity include:

• Sleep history. Your doctor will ask you for a detailed sleep history. A part of the history involves filling out the Epworth Sleepiness Scale, which uses a series of short questions to gauge your degree of sleepiness. For instance, you indicate on a numbered scale how likely it is that you would doze off in certain situations, such as sitting down after lunch.
• Sleep records. You may be asked to keep a detailed diary of your sleep pattern for a week or two, so your doctor can compare how your sleep pattern and alertness are related. Often, in addition to this sleep log, the doctor will ask you to wear an actigraph. This device has the look and feel of a wristwatch and measures how and when you sleep.
• Polysomnogram. This test measures a variety of signals during sleep using electrodes placed on your scalp. For this test, you must spend a night at a medical facility. The test measures the electrical activity of your brain (electroencephalogram) and heart (electrocardiogram) and the movement of your muscles (electromyogram) and eyes (electro-oculogram). It also monitors your breathing.
• Multiple sleep latency test. This examination measures how long it takes you to fall asleep during the day. You'll be asked to take four or five naps, each nap 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.

These tests can also help doctors rule out other possible causes of your signs and symptoms. Other sleep disorders, such as sleep apnea, can cause excessive daytime sleepiness.

Another test your doctor might recommend is a hypocretin test, which measures the levels of hypocretin in the fluid that surrounds your spinal cord. Most people with narcolepsy have low levels of this brain chemical that regulates REM sleep. A sample of your spinal fluid is obtained with a lumbar puncture (spinal tap), during which a needle is inserted into your lower spine to withdraw spinal fluid.

©1998-2012 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.
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There is no cure for narcolepsy, but medications and lifestyle modifications can help you manage the symptoms.

Medications
Medications 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. Doctors often try modafinil (Provigil) first for narcolepsy because it isn't as addictive as older stimulants and doesn't produce the highs and lows often associated with older stimulants. Side effects of modafinil are uncommon, but they may include headache, nausea, dry mouth, anorexia and diarrhea. Modafinil may increase blood pressure, especially at high doses. Some people need treatment with methylphenidate (Concerta, Ritalin, others) or various amphetamines. Although these medications are effective, they may cause side effects, such as nervousness and heart palpitations, and can be addictive.
• Selective serotonin or norepinephrine reuptake inhibitors (SSRIs, SNRIs). Doctors often prescribe these medications, which suppress REM sleep, to help alleviate the symptoms of cataplexy, hypnagogic hallucinations and sleep paralysis. They include atomoxetine (Strattera), fluoxetine (Prozac, Sarafem, others) and venlafaxine (Effexor). The most common side effects include decreased sexual desire and delayed orgasm. Other side effects may wane over time. They can include digestive problems, jitteriness, restlessness, headache and insomnia.
• Tricyclic antidepressants. These older antidepressants, such as protriptyline (Vivactil) and imipramine (Tofranil), are effective for cataplexy, but many people complain of side effects, such as dry mouth and constipation.
• Sodium oxybate (Xyrem). This medication may be prescribed for severe cataplexy. Sodium oxybate helps to improve nighttime sleep, which is often poor in narcolepsy. In high doses it may also help control daytime sleepiness. It must be taken in two doses, one at bedtime and one up to four hours later, and it can take two to three months to achieve its full effect, although benefits will be apparent early on. Xyrem can have serious side effects, such as nausea, bed-wetting and worsening of sleepwalking. Too high a dose can lead to difficulty breathing, coma and death.

If you have other health problems, such as high blood pressure or diabetes, ask your doctor how the medications you take for your other conditions may interact with those taken for narcolepsy.

Certain over-the-counter drugs, such as allergy and cold medications, can cause drowsiness. If you have narcolepsy, your doctor will likely recommend that you avoid taking these medications.

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Lifestyle modifications are important in managing the symptoms of narcolepsy. You may benefit from these steps:

• 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 at strategic times during the day may be refreshing and reduce sleepiness for one to three hours. Some people may need longer naps.
• Avoid nicotine and alcohol. Using these substances, especially at night, can worsen your signs and symptoms.
• Get regular exercise. Moderate, regular exercise at least four to five hours before bedtime may help you feel more awake during the day and sleep better at night.

©1998-2012 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.
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Dealing with narcolepsy can be challenging. Making adjustments in your daily schedule may help. Consider these tips:

• Talk about it. Tell your employer or teachers about your condition and work with them to find ways to accommodate your needs. This may include taking naps during the day, breaking up monotonous tasks, recording meetings or classes, standing during meetings or lectures, and taking brisk walks at various times throughout the day. The Americans With Disabilities Act prohibits discrimination against workers with narcolepsy and requires employers to provide reasonable accommodation to qualified employees.
• Be safe. If you must drive a long distance, work with your doctor to establish a medication schedule that ensures the greatest likelihood of wakefulness during your drive. Stop for naps and exercise breaks whenever you feel drowsy. Don't drive if you feel your sleepiness is not well controlled.

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

©1998-2012 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.
Read this article on Mayoclinic.com.