Henry Fuseli’s 1781 masterpiece, The Nightmare, did more than shock the conservative audiences of London’s Royal Academy of Arts. It fundamentally anticipated the core tenets of modern psychoanalysis over a century before Sigmund Freud published The Interpretation of Dreams. The painting depicts a sleeping woman bathed  grove street art in brilliant light, draped helplessly across a bed while a grotesque incubus sits heavily upon her chest. From the dark background drapes, a wild-eyed, ghostly horse rears its head. Rather than pulling from biblical narratives or classical mythology, Fuseli drew directly from the raw, unmapped territory of the human subconscious.

The painting provides a stark visual manifestation of internal psychological conflict. To twentieth-century psychoanalysts, the canvas acts as an early blueprint of the Freudian id—the reservoir of primitive impulses, taboo sexual desires, and repressed anxieties. The weight of the crouching creature captures the terrifying physical sensation of sleep paralysis. Simultaneously, it represents the psychological weight of unspoken desires that the conscious mind actively represses during waking hours. Fuseli brilliantly splits the canvas into two distinct psychological realities: the peaceful, objective physical body below, and the dark, chaotic dreamscape raging directly above it.

Freud himself recognized the profound psychological truth captured in Fuseli’s brushstrokes. During his time at Berggasse 19 in Vienna, Freud chose to hang a reproduction print of The Nightmare on the wall of his apartment and consulting rooms. It hung significantly alongside Rembrandt’s The Anatomy Lesson. While Rembrandt symbolized the clinical dissection of the physical body, Fuseli represented the dissection of the human psyche. For Freud’s patients, the image served as an unsettling visual prompt for the mysterious forces governing their fears.

Furthermore, Freud’s close colleague, Ernest Jones, used a variant of Fuseli’s image as the frontispiece for his foundational book, On the Nightmare. Though nightmares initially challenged Freud’s strict concept of dreams as pure wish fulfillment, the artwork perfectly visualized the complex interplay of anxiety and suppressed impulses. By externalizing the abstract terrors of sleep, Fuseli proved that artists had mapped the dark corners of human consciousness long before science possessed the vocabulary to explain them.