6 Bizarre Things Your Brain Does While You Sleep

You Hear Explosions That Aren't There

You’re almost asleep when a deafening gunshot, a crashing cymbal, or a massive explosion jolts you wide awake. But there’s no sound. No one else heard it. That’s Exploding Head Syndrome — a perfectly real, perfectly terrifying sleep disorder. It typically happens as you’re falling asleep or waking up, and it’s caused by a sudden, brief burst of neuronal activity in the brain’s sensory processing centres. It’s harmless, but try telling your racing heart that.