What It's Like to Have Exploding Head Syndrome

If you've ever heard a sudden loud noise in your sleep that turns out to be imaginary, you're not losing your mind. In fact, you're among the roughly 10-15% of people who have experienced Exploding Head Syndrome (EHS), a phenomenon that strikes as a person is falling asleep. Here's what you need to know about the condition. Exploding Head Syndrome can sound strange and disorienting EHS starts when you hear a loud noise, ranging from the sound of fireworks and gunfire to thunder and lightning.