BodyInterestingIt is very difficult to sneeze with your eyes open due to an involuntary reflex. The eye-closing is controlled by the same cranial nerve that triggers sneezing, creating an automatic protective response, though it's not actually to protect eyes from bacteria.1831k
BodyInterestingBetween 18-35% of people sneeze when exposed to bright light, especially sunlight. This is called the photic sneeze reflex, and it's caused by crossed signals between the trigeminal nerve (which controls sneezing) and the optic nerve.151k