The Nightmare is a genuinely scary look into the real life experiences of people suffering with sleep paralysis. It's fascinating to hear first hand what it is that the victims are experiencing, particularly when you see how their stories overlap with shared or similar visions. The reconstructions that play also draw you into the experience yourself, so it almost plays out more like a horror film than a documentary.

Therein lies my biggest gripe about this film, it's not really an examination of the phenomenon, just a retelling of a group of peoples night terrors. At no point is there a medical or scientific point of view on the subject; all the "evidence" presented is anecdotal. Not only this, the editing almost tries to lean toward a spiritual viewpoint, which is disappointing as instead of getting to learn about this condition it tends to feel more like a religious propaganda piece, going so far as to claim that the only defence against this particular nightmare is the word "jesus".

Entertaining, but not overly useful if your hoping to learn something.