This chapter tackles Zola’s incongruous experiment in Le Rêve (1888) with an ‘idealist’ style of fiction. Generally understood as a strategic demonstration of the author’s versatility, Le Rêve also responds to a longstanding negotiation with the language of idealism – one rooted, the chapter argues, in Zola’s complex relationship to the century’s most prominent idealist writer, George Sand. The chapter reads Le Rêve as effectuating a return to Sand’s aesthetic, which Zola had assimilated into the troublesome figure of the dream. It tracks the burgeoning imagination of Zola’s heroine via Freud’s ‘Family Romances’, then via Marthe Robert’s Freudian genealogy of the novel, which together reveal the mutual entailments of authorial creativity and childhood fantasy. Zola’s roman d’artiste emerges as another projection of idealist tendencies onto women – most obviously, Sand, but also the artist-heroine of Le Rêve, who is made to embody Sand’s congenital extravagance.