Exploding Head Syndrome is a form of parasomnia, meaning unwanted episodes that happen when you’re sleeping. EHS is just as it sounds - it’s a loud, unexpected noise that you hear in your head right before you fall asleep, or in the middle of the night while you’re sleeping. Some people say it sounds like a thunderclap, a cymbal crashing, or literally like an explosion. Occasonally it has been reported to be accompanied by a flash of light, a body jerk, or even a stabbing pain.
No one really knows what causes Exploding Head Syndrome, but it does seem to be triggered by stress and lack of sleep. Women are more prone to this syndrome than men, and although it has been reported in children as young as 10, the average age for the first occurrence of EHS is 58.