Exploding Head Syndrome: Causes, Risks and How to Stop It

Last updated: October 2026

Exploding head syndrome is a harmless sleep disorder where you hear a sudden loud bang, crash or explosion in your head as you drift off or wake up. It isn’t painful and isn’t a sign that anything is wrong with your brain. Episodes last seconds. Regular sleep, less stress and sleeping on your side may help.

Below: what it feels like, how common it is, what causes it, how it differs from hypnic jerks, sleep paralysis, tinnitus and a thunderclap headache, what helps and when to see a GP.

What is exploding head syndrome?

Exploding head syndrome (EHS) is a parasomnia: an unusual experience that happens around sleep. It is listed in the International Classification of Sleep Disorders (ICSD-3), the manual sleep specialists use. Researchers also call it “episodic cranial sensory shock”.

There is no explosion and no damage. Your brain briefly creates the sound itself, usually in the twilight moments as you fall asleep, and sometimes as you wake in the night or in the morning. People describe it as:

a bang, gunshot, explosion or loud crash
a sudden “snap” or a jolt like electricity
a flash of light at the same time (27% of people in one study of students)
a racing heart, fear and a jolt awake straight afterwards

The key feature is that it doesn’t hurt. Some people only have it once or twice; others have it on and off for years. A review of published cases found an average of anywhere from one episode a week to one a day, and some people have several in one night. There is no NHS page on exploding head syndrome itself, so this guide draws on peer-reviewed research and NHS advice on similar sleep problems.

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How common is exploding head syndrome?

More common than its name suggests. It used to be thought rare and mostly a problem for people over 50, but newer studies find it in younger adults too. The figures vary a lot depending on who was asked and how strict the definition was:

Study	Who was asked	Had it at least once
Sharpless, 2015	211 US university students, clinical interview	18% (16.6% more than once)
Denis and colleagues, 2019	1,683 adults, international online survey	29.6% (3.9% monthly)
Tsovoosed and colleagues, 2025	1,843 local government workers in Japan	1.25% met the full diagnostic criteria
Frese and colleagues, 2014	Review of published case reports	Median age at onset 54; slightly more women

The honest summary: a sizeable minority of people will have at least one episode, but far fewer have it often enough to meet the full definition. In the student study, 36.9% of people who had sleep paralysis also had exploding head syndrome, so the two often go together.

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What causes exploding head syndrome?

Nobody knows for sure. A 2014 review found five main theories, and none has won out. The idea most often discussed is that as you fall asleep, your brain switches off in stages. The brainstem’s reticular activating system, which manages the shift from wake to sleep, may have a brief hiccup, and the circuits that normally dampen hearing may switch off late or all at once. The brain reads that burst of activity as a huge noise.

What the research does show is which things tend to go with it:

Short or broken sleep. In a survey of more than 6,000 adults, people with EHS slept less, took longer to fall asleep and had more insomnia symptoms. See sleep deprivation and sleep debt.
Stress and anxiety. Stress was the second most common cause people gave for their episodes (34.7%). If your mind races in bed, read anxiety at night.
Irregular sleep. This hasn’t been studied much for EHS itself, but the NHS lists disrupted sleep from jet lag or shift work as a trigger for sleep paralysis, which often comes with EHS.
Sleeping on your back. Students with EHS said episodes were most likely when lying face up.
Other sleep experiences, especially sleep paralysis and nightmares.

These are links from surveys, not proof of cause, but they are all worth working on.

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Is exploding head syndrome dangerous?

No. The first large case series, 50 patients seen by a neurologist in Hull in 1989, stressed that it is benign and that neither extensive tests nor treatment were needed. Later reviews agree. It isn’t a stroke or a bleed on the brain, and epilepsy is an unlikely explanation for most people.

What it can do is frighten you. In the biggest survey so far, 44.4% of people with EHS felt significant fear during episodes, a quarter were distressed by it, and about 1 in 10 said it interfered with their life, mostly those who had it often. Fear of the next bang can keep you awake, which can make episodes more likely. Knowing what it is often breaks that loop.

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Exploding head syndrome or something else?

Condition	What you notice	Painful?	What to do
Exploding head syndrome	A sudden bang or crash in your head as you fall asleep or wake	No	Reassurance and better sleep habits
Hypnic jerks	A sudden kick or falling feeling as you drop off	No	Usually nothing; less caffeine and stress
Sleep paralysis	Awake but unable to move or speak for a short time	No	Regular sleep; see a GP if it’s frequent
Tinnitus	Ringing, buzzing or humming that lasts, often noticed in a quiet bedroom	No	See a GP if it’s regular, getting worse or bothering you
Thunderclap headache	An extremely painful headache that starts suddenly and doesn’t go away	Yes, severe	Call 999: it can be a bleed on the brain

EHS and hypnic jerks can happen together, and some people have a muscle twitch with the bang. The difference that matters most is pain: a bang with no pain that’s over in seconds fits EHS, while a sudden, severe headache is a medical emergency.

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How to stop exploding head syndrome

There’s no cure and no licensed treatment, but many people find episodes fade once they stop worrying about them. These steps are what researchers suggest.

Know what it is. Reassurance is the main treatment. Tell yourself, “That was EHS. It’s harmless,” and let your breathing settle.
Keep regular sleep. In the large survey, adjusting sleep patterns and cutting tiredness were among the strategies people rated as working. The NHS advice for sleep paralysis is a good model: 7 to 9 hours a night, at roughly the same times. Our sleep schedule guide shows how.
Sleep on your side. As episodes seem more likely on your back, try a pillow behind you. See the best sleeping position.
Lower stress before bed. A wind-down hour, 4-7-8 breathing or progressive muscle relaxation can help you switch off. Our bedtime routine for adults puts it together.
Avoid caffeine and alcohol late in the evening, part of good sleep hygiene.
If it wakes you, see our tips on how to stay asleep.

Medicines. For the small number of people with frequent, distressing episodes, specialists have sometimes tried prescription medicines, such as a tricyclic antidepressant. The evidence comes only from case reports, with no proper trials, so this is a decision for a sleep or neurology specialist, not something to try yourself.

Where we fit in. Our Magnesium Glycinate Sleep Complex is a berry-flavoured bedtime drink with magnesium bisglycinate and citrate, glycine, L-theanine, chamomile, passionflower, hops and oat straw. Magnesium contributes to normal psychological function and to the normal functioning of the nervous system. It isn’t a treatment for exploding head syndrome and won’t stop episodes, but a warm drink can be a calm cue that the day is done. We don’t recommend our products during pregnancy or breastfeeding. Read more in magnesium for sleep.

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When to see a GP

You don’t usually need to see anyone for exploding head syndrome. See a GP if:

episodes are frequent and you’re anxious about going to sleep, or tired all the time
you hear bangs or noises when you’re fully awake
the noise comes with headache or pain
you have other symptoms, such as confusion that lasts, fainting, a seizure, numbness or weakness

There’s no specific test: sleep studies don’t show a typical pattern, so it’s recognised from your description. A GP may refer you to a sleep clinic if it’s badly affecting your sleep or something else needs ruling out. A short diary of when episodes happen helps.

Call 999 if you or someone else gets a sudden, extremely painful headache that doesn’t go away, or face drooping, weakness on one side, trouble speaking or a seizure.

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FAQs

Is exploding head syndrome dangerous?

No. It is a benign sleep disorder. The bang is created by your brain as it switches between sleep and waking, and it causes no damage. It can be frightening, which is why understanding it helps.

How long does an exploding head syndrome episode last?

Usually a second or a few seconds. Your heart may race for a little longer afterwards. Some people get a single episode in their life; others get clusters over weeks or months that then fade.

Can you have exploding head syndrome while awake?

By definition, it happens as you fall asleep or wake up. If you hear bangs or loud noises when you’re fully awake, see a GP.

Why do I hear a loud bang when falling asleep?

The most likely reason is exploding head syndrome. As your brain shuts down for sleep, a brief burst of activity may be read as a loud noise. It’s more likely when you’re short of sleep, stressed or sleeping on your back.

Is exploding head syndrome linked to tinnitus?

Not clearly. A small UK audiology study found 8.1% of people seeking help for tinnitus had EHS, similar to the general population. Tinnitus is a ringing or buzzing that lasts or comes and goes, while EHS is a sudden bang as you fall asleep or wake.

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