Almost everybody feels unusually tired or drained at times, and that’s normal. But could your lack of energy be a sign that something else is going on? Two possibilities for your weariness are fatigue and narcolepsy.
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You may have heard the words, but there’s a lot of confusion about the particulars on these two very different conditions.
We talked to neurologist Tina Waters, MD, to find out more.
Fatigue: A struggle to keep going
- Lack of energy. Fatigue is a self-reported lack of physical or mental energy. People with fatigue do not usually complain of excessive daytime sleepiness. But when they do sleep or rest, it often fails to boost their energy levels.
- Difficulty staying active. You may have a hard time getting yourself going, and once you start an activity you may struggle to keep going.
- Trouble with memory and mood. Some people find that it’s difficult to concentrate or remember things. Some people struggle with emotional stability.
Narcolepsy: Sleep intruding on your days
Narcolepsy is a disorder of sleep-wake control — sleep intrudes into wakefulness and waking intrudes into sleep. There are specific signs that point to narcolepsy:
- Excessive daytime sleepiness. Many people with narcolepsy are unable to stay awake and alert during the day. There are times when they have an irrepressible need for sleep, or unintended lapses into sleep. This is more severe at times and is more likely to happen when you’re sedentary or in a boring or monotonous situation, such as when you’re watching TV or driving a vehicle.
- Hallucinations. Some people have vivid, often frightening visual, tactile, or auditory hallucinations as they fall asleep, referred to as hypnagogic hallucinations.
- Sleep paralysis. Some people are completely unable to move for one or two minutes after they wake up or just before they fall asleep.
- Sudden loss of muscle tone. Cataplexy is a sudden loss of muscle tone that leaves you weak in reaction to strong emotion, especially laughter and excitement. The muscle weakness often affects only parts of the body — often the face, neck and knees. You likely will not lose consciousness, but often are temporarily unable to respond. Not everyone with narcolepsy has cataplexy.
Most people wake up refreshed after sleeping, but begin to feel sleepy again prematurely. Staying active may help you fight the urge to sleep.
What’s behind these disorders?
For fatigue: Dr. Waters says there is often an underlying cause. Here are some possibilities:
For narcolepsy: The exact cause is uncertain, but may relate to a loss of orexin signaling for some people. (Orexin is a neurotransmitter that helps regulate your sleep and wake states.) The hypothalmus in the brain releases orexin to help stimulate other brain regions to help keep you awake. If there is not enough orexin, normal sleep and wake patterns sometimes blur.
Other possible causes of narcolepsy include:
- Genetic factors
- An autoimmune response
- Rare brain lesions from tumors or strokes
How do doctors treat these conditions?
For fatigue: Since it is likely a sign of another problem, your doctor will focus on finding and treating that.
If a primary cause is not found, your doctor may recommend:
- Cognitive behavioral therapy. It challenges beliefs and awareness of your fatigue, helping you control symptoms and change behavior that may make your condition worse.
- Graded exercise therapy. It helps with underlying deconditioning, starting with low-intensity activity like walking or stretching and building from there.
For narcolepsy: Your doctor likely will encourage changes in behavior, such as strategic napping and caffeine intake. However, you may need prescription medications to help stay awake during the day or improve sleep quality at night.
Dr. Waters also recommends having a good psychosocial support system. Talking to your family about your condition or working with a counselor or a support group can help a lot.
A help for both conditions: Get better rest
Good sleep hygiene is important whether you’re dealing with fatigue or narcolepsy, Dr. Waters says.
Here are some tips:
- Allow adequate time for sleep at night — most people need between 7 and 8 hours — and keep consistent bed/wake times.
- Keep your bedroom comfortable, cool, dark and quiet.
- Arrange for a wind-down period of time before bed to calm your mind and body.
- For best results, remove electronics from your bedroom. TVs, phones, tablets and computers all can disrupt your sleep.
Dr. Waters says daily exercise can also improve sleep quality at night.
If you feel tired all the time or have trouble staying awake in meetings or at other times during the day, talk to your doctor. He or she can help you pinpoint the cause and find a way to treat it.