Exploding head syndrome
Exploding head syndrome is a parasomnia condition that causes the sufferer occasionally to experience a tremendously loud noise as originating from within his or her own head, usually described as the sound of an explosion, roar, gunshot, loud voices or screams, a ringing noise, or the sound of electrical arcing (buzzing). This noise usually occurs within an hour or two of falling asleep, but is not necessarily the result of a dream and can happen while awake as well.
So that’s what it’s called. Via the always great On the Borderland.

![To make things worse, our kids always insist on sleeping ON TOP of our blanket, creating a whole new set of problems.
From Good Night and Tough Luck, Christoph Niemann’s illustrated article about the not so simple art of sleep. My son does the same thing, drives me bananas. [via]](http://25.media.tumblr.com/tumblr_kq3bqbBhDb1qz4a77o1_500.jpg)