Hypnagogic Hallucinations: Why You Might Have Them - WebMD

• Sleep Disorders
• Reference

Healthy Sleep Guide

• Good Sleep Habits
• Sleep Disorders
• Other Sleep Problems
• What Affects Sleep
• Tests & Treatment
• View Full Guide

Written by Lisa GuthrieMedically Reviewed by Jabeen Begum, MD on February 12, 2026

• Should I Be Concerned About Hypnagogic Hallucinations?
• What Are Other Sleep-Related Experiences?
• What Causes Hypnagogic Hallucinations?
• Are Hypnagogic Hallucinations Dangerous?
• Treatment for Hypnagogic Hallucinations
• Other Considerations
• Takeaways
• Hypnagogic Hallucinations FAQs

4 min read

Hypnagogic hallucinations are visions or sounds that happen as you fall asleep. The idea of having hallucinations can be upsetting. Hallucinations are usually associated with serious mental conditions or the effects of drugs. If you have an unexplained hallucination while trying to sleep, you may wonder if something is wrong.

Should I Be Concerned About Hypnagogic Hallucinations?

While some types of hallucinations are concerning, many people experience harmless hallucinations while falling asleep. They are called hypnagogic hallucinations, and they are fairly common. You may hear or see things that seem real while you are in the state between waking and sleeping. Other senses, such as smell and touch, may also be involved.‌

These hallucinations aren't a symptom of mental illness. Experts don't know exactly what causes them, but they know they aren’t a cause for concern. They're simply something that your brain might do during the process of falling asleep.

Sometimes, hypnagogic hallucinations happen along with a state of sleep paralysis. In sleep paralysis, the muscles in your body will be immobile, and you won't be able to move. The combination of immobility and hallucinations can be frightening. It can last up to several minutes before your muscles return to normal.

People who have a sleep disorder called narcolepsy are more likely to have hypnagogic hallucinations. Narcolepsy causes you to sleep excessively and feel very tired all of the time. If you think you have narcolepsy, talk to your doctor about your symptoms.

What Are Other Sleep-Related Experiences?

Another common experience while falling asleep is a hypnic jerk, or sleep start. As you are drifting off, you may be aware of a sensation of falling, or you may feel like you are dreaming about falling. Your body may suddenly jerk you awake. These sleep starts are most likely harmless. 

The movement in hypnic jerks is an involuntary muscle spasm called myoclonus — hiccups are another example of this type of spasm. Not all hypnic movements will wake you up the way a sleep start will. Sometimes, the movements will be small twitches that you won't even notice.

Some people have hallucinations as they're waking up. These are called hypnopompic hallucinations. These types of hallucinations are similar to hypnagogic hallucinations, but they may feel more like an extension of a dream. Sleep paralysis is often associated with hypnopompic hallucinations.

Sleep hallucinations are different from dreams, and they feel more real than dreams do. When you wake from a dream, you usually realize right away that it wasn't real. But in a sleep hallucination, you may need several minutes to figure out what is real and what isn't.

What Causes Hypnagogic Hallucinations?

For many people, sleep hallucinations don't have a clear cause. In other cases, there are some factors that can lead to sleep hallucinations, including:

• Alcohol or drug use
• Certain prescription medications
• Chronic insomnia
• Anxiety, stress, or other mental health issues

Are Hypnagogic Hallucinations Dangerous?

In general, hypnagogic hallucinations aren't dangerous, even if they can be unsettling. For most people, they don't happen often and are not connected with any other health issues. But if they start to happen often and affect your ability to get enough sleep, talk to a doctor.

Treatment for Hypnagogic Hallucinations

If you find that you can't sleep due to frequent sleep hallucinations, your doctor will work with you to figure out a solution.‌

Lifestyle changes. If stress or anxiety lead to your sleep hallucinations, your doctor may suggest relaxation techniques that make falling asleep easier. Mediation, conscious relaxation, or other calming practices may help. They may also suggest that you use good sleep hygiene by keeping your bedroom uncluttered, dark, and cool. Consider using your bedroom only for sleep to create the mental link between that room and rest.‌

Health factors. If you are taking a prescription medication that is causing sleep disturbances, talk to your doctor. You may be able to change medications to improve your sleep while still treating the original condition.

Drugs and alcohol. If you are using recreational drugs or alcohol, your doctor may tell you to stop. Stopping the drugs or alcohol will allow you to see if they are affecting your sleep.

Other Considerations

While sleep hallucinations aren't usually a cause for concern, having hallucinations at other times can be an indication of underlying health issues. If you hear voices or see things that aren't there, call your doctor right away. You may have a condition such as:

• Schizophrenia
• Alzheimer's disease
• Lewy Body dementia
• Parkinson's disease
• Macular degeneration
• Intoxication with alcohol or hallucinogenic drugs

Takeaways

Hypnagogic hallucinations are things you see or hear right as you're falling asleep. They're not a sign of mental illness and generally aren't anything to worry about. But you should see your doctor if these hallucinations start interfering with your sleep.

Hypnagogic Hallucinations FAQs

Are hypnagogic hallucinations a sign of a sleep disorder?

Hypnagogic hallucinations are not a sign of a sleep disorder, but they're more common in people who have insomnia, narcolepsy, and excessive daytime sleepiness.

How are hypnagogic hallucinations different from dreams or nightmares?

Hypnagogic hallucinations are usually short flashes of images or sounds. But dreams are generally longer and unfold like a story. Hypnagogic hallucinations happen just as you're drifting off to sleep, while dreams happen later, when you're completely asleep. After a dream, you will wake up and know that you were just dreaming and now you're not. The hypnagogic hallucinations happen while you're awake — even though you're almost asleep. It might take a minute for you to figure out what's real and what's not.

When should I see a doctor about hypnagogic hallucinations?

These hallucinations are generally nothing to worry about, and they're very common. But if they start messing up your sleep, it's time to see a doctor.

Understanding Sleep Problems

How to Sleep Better as You Get Older

Breathing Techniques for Sleep

Recommended

Top doctors in ,

Find more top doctors on

Search

Related Links

• Healthy Sleep News
• Healthy Sleep Reference
• Healthy Sleep Slideshows
• Healthy Sleep Quizzes
• Healthy Sleep Blogs
• Healthy Sleep Videos
• Sleep Problems
• Sleep Requirements
• Sleep Paralysis
• Sleeping Pills
• Nightmares
• Circadian Rhythm
• Insomnia
• Sleep Apnea
• Snoring
• Teeth Grinding
• Track Your Sleep
• Sleep Medications
• Find a Neurologist
• Find a Sleep Specialist