What is a nightmare as a psychological experience, a literary experiment and a cultural project? Why has experiencing a nightmare under the guise of reading a novel, watching a film or playing a video game become a persistent requirement of contemporary mass culture? By answering these questions, which have not been addressed by literary criticism and cultural studies, we can interpret anew the texts of classic authors. Charles Maturin, Nikolai Gogol, Fyodor Dostoevsky, Thomas Mann, Howard Philips Lovecraft and Victor Pelevin carry out bold experiments on their heroes and readers as they seek to investigate the nature of nightmare in their works. This book examines their prose to reveal the unstudied features of the nightmare as a mental state and traces the mosaic of coincidences leading from literary experiments to today’s culture of nightmare consumption.