"Dreaming Is a Private Thing" is a science fiction short story by American writer Isaac Asimov, first published in the December 1955 issue of The Magazine of Fantasy and Science Fiction and reprinted in the 1957 collection Earth Is Room Enough. Asimov's original title for the story was "A Hundred Million Dreams at Once", but F&SF editor Anthony Boucher changed it: Asimov liked the new title and decided to keep it.