Other critics have been more skeptical of the concept of identifying the dreamer of the book's narrative. Clive Hart argues that "our conclusions about the identity of the dreamer, and no matter how many varied caricatures of him we may find projected into the dream, it is clear that he must always be considered as essentially external to the book, and should be left there. Speculation about the 'real person' behind the guises of the dream-surrogates or about the function of the dream in relation to the unresolved stresses of this hypothetical mind is fruitless, for the tensions and psychological problems in "Finnegans Wake" concern the dream-figures living within the book itself."