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Exploding head syndrome may sound like a made-up condition - in fact, it's a real and frightening medical disorder, and one that a study suggests is surprisingly common.
People with exploding head syndrome (EHS) hear loud noises when going to sleep or on waking up.
The type of noise can vary from explosions and fireworks to slammed doors, the sound of a gun firing, an enormous roar, shouting, thunder or a crack of lightning. The noises start suddenly and last for a few seconds.
Before hearing the loud noise, one in ten also has visual disturbances, such as seeing lightning or flashes. These are similar to the auras some people have before a migraine headache.