sleep disorder

i experience this about twice a month:

Exploding head syndrome
Okay, exploding head syndrome doesn't actually involve detonating domes. This creatively named disorder occurs during the onset of deep sleep, when the person is suddenly startled awake by a sharp, loud noise. These noises range from cymbals crashing to explosives going off. To the person hearing them, the explosions seem to originate either from right next to the person's head or inside the skull itself. There's no pain involved, and no danger, either. Doctors don't know what causes exploding head syndrome, but they do know that it isn't associated with any serious illness.

glad to hear i'm not the only one.

http://www.msnbc.msn.com/id/35606027/ns/health-behavior/wid/11915773?GT1=31036