This has happened to me many times as well, I had no idea this was a syndrome or sleep disorder. I recently turned 40 and am female, I first experienced this around 3-4 years ago. The first time it happened, I felt like my head exploded In my sleep. It sounded like a LOUD gunshot. I was terrified! I had know idea what was going on, I was questioning whether I had a seizure in my sleep. I never mentioned it to a doctor, I didn't know what to think. It happened for many nights after the first time. Now it randomly happens.