Exploding head syndrome.

As the name suggests, exploding head syndrome is also a rare and mysterious medical condition which is characterised by loud, sudden noises that the sufferer perceives as coming from within their own head, usually when a person is asleep. Although it may sound like something out of a horror movie, this condition is very real.

While the exact cause of exploding head syndrome is still unknown, it is believed to be linked to stress, sleep...