Dreams and nightmares—what Ambrose Bierce called “visions of the night”—are the basis of some of the greatest weird fiction in literary history. The unruly images that torment us in sleep are usually dispelled by the coming of day—but can they be dismissed so easily? Do nightmares have some impalpable reality that can affect our daily lives, the lives of those around us, and perhaps the very fabric of the universe? Who can say that the nightmare is merely a wisp of fancy engendered by our own minds? After all, it was Edgar Allan Poe who said: “All that we see or seem is but a dream within a dream.” All original nightmares by David Barker, Jason V Brock, Ramsey Campbell, Gemma Files, Richard Gavin, Caitlín R. Kiernan, Nancy Kilpatrick, John Langan, Reggie Oliver, W. H. Pugmire, Darrell Schweitzer, John Shirley, Simon Strantzas, Steve Rasnic Tem, Jonathan Thomas, Donald Tyson and Stephen Woodworth. This volume is edited by S. T. Joshi, a leading critic and anthologist of weird fiction.