I have photic sneeze reflex, hypnic jerk, and TIL exploding head syndrome. I associate hypnic jerk with a sensation of falling, whereas exploding head syndrome

I have photic sneeze reflex, hypnic jerk, and TIL exploding head syndrome. I associate hypnic jerk with a sensation of falling, whereas exploding head syndrome is a loud bang and bright flash. They both make you jump. I didn't know there was a different term for the loud bang/flash type.