The family was on a cruise and the only toy that Tessa wanted to bring was the happy napper dog that she got for her birthday. So daddy started singing the song.
Daddy: They are happy, happy nappers, they'll make all you dreams come true--hey, now that you have one, did ALL of your dreams come true?
Tessa: Only the favorite ones!
Daddy: Which ones are those?
Tessa: To get happy nappers.
Daddy: How convenient.