Nightmares, fear, wake up in the middle of the night, and the feeling that man is not able to move. On the chest feel the weight, which deprives the air. Out of the corner of the eye we see a sinister figure on the side ... it is not a bad dream, but the most common symptoms of the state called sleep paralysis or paralysis.
Alice (Maggie Q) is a respected sleep specialist. The family that is haunted by the demon is asked to help her. He paralyzes his victims during sleep, becoming their true nightmare and releasing the terrible aggression they face.
Alice must give up scientific rationalism to help the struggling family and confront their own demons from the past.