Sleep attacks: What to expect after a narcolepsy diagnosis

Receiving a narcolepsy diagnosis may provide an explanation for symptoms you have experienced for years. Sleep attacks — episodes marked by a sudden or overwhelming need to sleep, even after adequate nighttime rest — may be among the most noticeable.

Understanding these episodes and recognizing your warning signs can help you manage them more safely and effectively.

What does a sleep attack feel like?

Sleep attack is an informal term that describes an episode of overwhelming sleepiness that comes on quickly. During an episode, you may struggle to stay awake or fall asleep while talking, eating, working, or doing another activity.

You might feel as though you are suddenly shutting off, or you may notice increasing drowsiness before falling asleep. You also may have difficulty remembering what you were doing immediately before the episode.

Some people with narcolepsy experience automatic behavior. This means you continue a familiar activity, such as writing or putting away objects, while you are not fully aware of what you are doing. You may have little or no memory of the activity afterward.

Microsleeps vs. sleep attacks

Microsleeps and sleep attacks are different types of sleep episodes. A microsleep is an involuntary episode of sleep that lasts only a few seconds. You may appear awake, but your brain may not fully process information during that time. Microsleeps can occur because of narcolepsy, sleep deprivation, or other causes.

Because sleep attack is not a formal medical term, it does not have one standard definition or duration. It generally refers to a broader experience of irresistible sleepiness that may result in falling asleep.

Sleep attacks and microsleep should be distinguished from cataplexy, which is a hallmark feature of narcolepsy type 1. With cataplexy, there is a variable loss of muscle tone, often triggered by a strong emotion. This can result in mild symptoms, such as a feeling of heaviness in your head, arms, or other body parts, or slurred speech. But it can also lead to the involvement of the entire body, with an inability to move. This does not need to involve falling asleep. Still, given that sleepiness is a big factor in narcolepsy, those with cataplexy may end up falling asleep during these episodes as well.

Safety note: Do not drive or operate machinery if you feel suddenly sleepy, faint, confused, or unable to control your movements. If symptoms begin while you are driving, pull over in a safe place as soon as possible.

Are sleep attacks always sudden?

Sleep attacks can come on quickly, but they may not always be completely without warning. You may fall asleep suddenly, or you may notice increasing drowsiness, difficulty concentrating, or other signs that you are struggling to stay awake.

The timing also can vary. Some episodes occur during quiet or passive activities, such as watching television or riding in a car. Others may happen during activities that usually require more attention.

How long can a sleep attack last?

There is no standard answer for how long sleep attacks last. Because the term is used informally, it may describe anything from a brief lapse into sleep to a longer nap. The length and frequency of these episodes can differ from person to person.

Sleep attacks and narcolepsy

EDS is a defining symptom of narcolepsy, but you do not have to experience dramatic or sudden sleep attacks to receive a diagnosis. Some people are most likely to fall asleep during passive activities, while others may experience an overwhelming need to sleep in the midst of conversations, meals, work, or other activities. Others may notice that they can essentially stay awake during work or school, but as soon as they stop any activity for a quick break, they may have the overwhelming urge to sleep.

Unexpectedly falling asleep does not always mean you have narcolepsy. In fact, factors such as insufficient sleep and other sleep disorders, such as obstructive sleep apnea, are far more common than narcolepsy in causing excessive daytime sleepiness. Diagnosing narcolepsy involves reviewing your symptoms and sleep history, tracking your sleep schedule, and completing overnight and daytime sleep studies. If you regularly experience excessive sleepiness or unintended sleep episodes, consider discussing them with your doctor.

Other causes of sudden or irresistible sleepiness

Narcolepsy is not the only possible cause of uncontrollable sleep episodes.

Other causes of excessive or sudden sleepiness may include:

• idiopathic hypersomnia
• sleep apnea
• long-term sleep deprivation
• shift work or an irregular sleep schedule
• certain medications or substances
• other medical or mental health conditions

A doctor can help determine whether your symptoms are related to narcolepsy, another sleep disorder, a medication, or another underlying cause.

Warning signs that sleep may be coming

Signs that you are becoming dangerously sleepy can vary.

You might notice:

• difficulty focusing or keeping your eyes open
• frequent blinking or yawning
• wandering or disconnected thoughts
• trouble remembering what you were doing
• head nodding
• speech that begins to trail off
• sudden, overwhelming drowsiness

You may not notice every warning sign before falling asleep. Keeping a record of when episodes occur and what you experience beforehand may help you and your doctor identify patterns.

What to do if you feel a sleep attack coming on

If you feel an overwhelming need to sleep, stop what you are doing as soon as it is safe. Move to a safe place where you can sit or lie down. If possible, take a short nap.

Short, scheduled naps are often part of a narcolepsy treatment plan and may help you manage daytime sleepiness. Ask your doctor whether planned naps may be appropriate for you and how to incorporate them into your daily routine.

Driving, machinery, and other safety risks

Sleep attacks and EDS can increase your risk of an accident while driving, using machinery, working with sharp objects, cooking, or performing other activities that require sustained attention.

If you become drowsy while driving, pull over in a safe place as soon as possible. Do not rely on opening a window, increasing the radio volume, or using similar strategies to keep yourself awake. Rest until you are no longer drowsy, or change drivers if possible.

Talk with your doctor regularly about your symptoms and whether it is safe for you to drive. Your doctor may recommend strategies such as:

• taking a planned nap before driving or another demanding activity
• scheduling frequent breaks
• limiting how long you drive or perform certain tasks
• planning demanding activities for times when you are typically most alert
• strategic usage of caffeine
• taking prescribed medication to help manage daytime sleepiness

Your ability to drive safely can change if your symptoms or treatment change. Driving laws and reporting requirements for people with narcolepsy also vary by location.

When sudden sleepiness needs medical attention

Occasional sleepiness can happen to anyone. Consider talking to your doctor if you:

• regularly struggle to stay awake during the day
• fall asleep unexpectedly during conversations, meals, work, driving, or other activities
• experience sleepiness that interferes with your work, relationships, or daily routine
• notice a sudden or substantial change in your usual level of alertness

Seeking an evaluation can help you understand what is causing your sleepiness and whether treatment or additional safety measures may help.

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Narcolepsy News is strictly a news and information website about the disease. It does not provide medical advice, diagnosis, or treatment. This content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.