 "Happy Christmas" has been used on almost every broadcast since 1956.One year included both greetings, and "blessed Christmas" was used in 1954 and 2007.In the American poet Clement Moore's "A Visit from St. Nicholas" (1823), the final line, originally written as "Happy Christmas to all, and to all a good night", has been changed in many later editions to "Merry Christmas to all," perhaps indicating the relative popularity of the phrases in the US.