What happens when a madman captures the Lord of Dreams? Neil Gaiman answers this question in the graphic novel, The Sandman: Preludes and Nocturnes.
While performing a dark ritual, Roderick Burgess attempts to capture Death, one of the Endless. But he captures Dream instead. Burgess hopes to control Dream and gain immortality, but Dream will not comply. He's caged for 70 long years, waiting for his captors to die. In the meantime, dreaming and waking are in turmoil. People have been asleep for years or cease to be able to sleep at all. No one outside the Order of Ancient Mysteries knows what caused the sickness.
Dream is eventually able to escape and exact his revenge on his ailing captors. Then he must find his stolen possessions and return normalcy to the realm of dreaming. Will he succeed or will one of the Endless cease to be?