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Dream of the Rarebit Fiend was another comic strip that Winsor McCay drew prior to Little Nemo. There is a long tradition of cartoonists reusing ideas, and here is an early example of that. You may notice that this one bears a striking resemblance to the Little Nemo strip from December 13, 1908. Of course, instead of Nemo hanging from the roof and freezing, it was originally Santa Claus (or at least John dreaming that he is Santa Claus).