Exploding Head Syndrome is a parasomnia disorder that causes sufferers to hear loud, explosion-like noises that seem to originate from within their own head. The "explosions" usually occur right after the victim has fallen asleep and sound like a roar, gunshot, loud voices or screams, a ringing noise, or the sound of electrical buzzing.

While victims of this syndrome aren't physically injured, they tend to experience fear and anxiety after such attacks. There is no known cause or cure for this condition, though it has been linked to stress and fatigue and often vanishes without treatment.