Exploding Head Syndrome: Phantom Gunshots at the Edge of Sleep

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Exploding head syndrome is a parasomnia in which a person drifting off or waking up hears a deafening internal noise, a gunshot, thunderclap, scream or explosion, that no one else hears and that causes no pain. The jolt can bring a racing heart, muscle jerks, sweating and a terrifying sense of having stopped breathing, and about 10 percent of sufferers also see flashes of light, while some feel heat or an electrical tingling rising toward the head. Estimates of how common it is range from rare to about 10 percent of people, with 14 percent in one study of undergraduates and 52.7 percent in one self report survey, yet only about 11 percent ever tell a doctor.

The cause is unknown. Leading theories include a misfire in the brainstem's reticular formation during the shift into sleep, shifts in the middle ear or a tear in the membranous labyrinth, and faulty calcium channels or GABA signaling. The history runs from a suspected 1691 account in René Descartes' biography to Silas Weir Mitchell's 1876 sensory discharges, Robert Armstrong-Jones's 1920 snapping of the brain and John M.S. Pearce's 1989 naming, with Peter Goadsby and Brian Sharpless now proposing episodic cranial sensory shock. As of 2025 there have been no clinical trials, and the most effective treatment is simply explaining that it is harmless.

• Episodes linked to lack of sleep, stress, anxiety, caffeine or alcohol before bed and some medications
• A median patient age in the 50s, with a typical ongoing pattern lasting about two years
• Why many sufferers stay silent for fear of being diagnosed with schizophrenia
• Small case reports on clomipramine, flunarizine, carbamazepine, magnetic stimulation and topiramate
• Episodes tending to happen while lying on the back, and sleep habits that may help