text: why do i sneeze everytime i see a bright light?   it is caused when you go from dim light to very bright light and your pupils are not able to reduce in time to cope with this extra light. in order that this light wont burn your retinas your body forces your eyes closed by making you sneeze. this commonly happens when you go from your reasonably dark lit house out onto a sunny street or if you turn on your beside lamp in the dark.