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For these people, looking at a bright light is enough to make them sneeze. 1  To find out if you are one of these people, try limiting your exposure to light and closing your eyes. 2  After your eyes have acclimated to the darkness, open your eyes and swiftly turn on a bright light.
Typically, your brain simply ignores these distracting flashes, but when you rub your eyes, stand up too fast, or sneeze hard, the pressure creates too many biophotons for your brain to handle, and they become visible for a brief second.