why do we say god bless you when somebody sneezes
God bless you National Geographic reports that during the plague of AD 590, "Pope Gregory I ordered unceasing prayer for divine intercession. Part of his command was that anyone sneezing be blessed immediately ("God bless you"), since sneezing was often the first sign that someone was falling ill with the plague."[7] By AD 750, it became customary to say "God bless you" as a response to one sneezing.[8]
Photic sneeze reflex The photic sneeze reflex (also known as photoptarmosis, Autosomal Dominant Compelling Helio-Ophthalmic Outburst Syndrome (ACHOO)[1] and colloquially sun sneezing) is a condition that causes variable difficulty to control sneezing in response to numerous stimuli, such as looking at bright lights or periocular (surrounding the eyeball) injection. The condition affects 18-35% of the population in the United States,[2] but its exact mechanism of action is not well understood.[3]