Yep. I know someone that has this almost everyday of his life and he hears a gunshot or a cannon that doesn't exist. It maybe related to spinal cord compression

Yep. I know someone that has this almost everyday of his life and he hears a gunshot or a cannon that doesn't exist. It maybe related to spinal cord compression from a genetic anatomical abnormality in the skull or cervical region between the skull and thorax. Oddly enough, I accidentally induced this effect on myself by falling asleep laying my neck on the corner of a hard surface. It sounded like someone beating hard once on the wall, but as I woke up, I realized no one was around and no sound had actually happened (no echo).