Parasomnias
Exploding Head Syndrome
Hearing a sudden loud bang or crash as you fall asleep or wake. Despite its alarming name, it is harmless and causes no pain.
Overview
Exploding head syndrome is a sleep-related sensory experience in which you hear a sudden, loud noise, such as a bang, explosion, gunshot or crash, as you are falling asleep or waking up. Some people also see a flash of light or feel a jolt. The sound is imagined, and there is no actual explosion or pain.
It can be frightening, and people sometimes fear a stroke or brain problem, but it is considered benign. It is thought to relate to how the brain shuts down as it transitions into sleep.
Episodes often come and go, and stress and sleep deprivation can increase them. Reassurance that it is harmless is often enough to reduce distress.
In a 2015 study of 211 college students, about 18% reported having experienced exploding head syndrome at least once.
Common symptoms
- A sudden loud noise heard while falling asleep or waking
- A flash of light at the same time in some people
- A startle with a racing heart
- Fear or anxiety after episodes
- No pain
Causes and risk factors
- Cause not fully understood
- Stress and anxiety
- Sleep deprivation and irregular sleep
- Often occurs alongside isolated sleep paralysis
How it is diagnosed
Diagnosis is based on the description of a painless loud noise at sleep onset or on waking. A clinician will ask about headaches and neurological symptoms to rule out other causes. Tests are usually not needed unless there are other concerning features.
Treatment options
Reassurance
Understanding that episodes are harmless often reduces their impact.
Improving sleep habits
Regular schedules and enough sleep may reduce episodes.
Stress management
Relaxation techniques can help.
Medication
Rarely used, and only for frequent, distressing episodes under specialist care.
What you can do yourself
- Keep a regular sleep schedule
- Practise relaxation before bed
- Reduce caffeine and alcohol
- Remind yourself that the sound is not real and not dangerous
When to see a doctor
- Noises come with pain, weakness, numbness or confusion
- You have a sudden severe headache (seek urgent care)
- Episodes are frequent and disturbing your sleep
Frequently asked questions
Is exploding head syndrome dangerous?
No. It is considered a harmless sleep phenomenon, and it does not cause pain or damage to the brain.
Why does it happen?
The exact cause is unknown. One idea is that parts of the brain that process sound switch off out of sync as you fall asleep, briefly producing a burst of perceived noise.
How common is it?
It is more common than once thought. In one study, about 18% of college students reported at least one episode.
When should I worry about a noise in my head?
Seek medical care if the noise comes with pain, a severe headache, weakness, numbness, vision changes or confusion, as these are not features of exploding head syndrome.
Sources
This page is general information, not a diagnosis or medical advice. Read our medical disclaimer.