Why do we say 'bless you' when people sneeze?

Its cuz of some superstitions like The heart stops when you sneeze, and the phrase "bless you" is meant to ensure the return of life or to encourage your heart to continue beating. Your soul might be seperated while sneezing and to provide that you say Bless u Germans say that bless u is said to wish someone a good health when they sneeze! So thats that

well when someone burps around me I do say excuse you! LOL I found this about sneezing Some well known superstitions that may have contributed to bringing "bless you" into common use are: The heart stops when you sneeze (it doesn't), and the phrase "bless you" is meant to ensure the return of life or to encourage your heart to continue beating. A sneeze is the expulsion of some sort of evil, and the phrase is meant to ward off the evil's re-entry. Your soul can be thrown from your body when you sneeze, and saying "bless you" prevents your soul from being stolen by Satan or some evil spirit. Thus, "bless you" or "God bless you" is used as a sort of shield against evil. A sneeze is good luck and saying "bless you" is no more than recognition of the sneezer's luckiness. If the sneezer replies "Thank you" then a fairy is killed. Alternatively, it may be possible that the phrase began simply as a response for an event that wasn't well understood at the time. Another urban legend states that you cannot open your eyes while you sneeze, or if you manage to your eyes will pop out. Both of the statements are untrue.