Synopsis: Sudden Unexplained Nocturnal Death Syndrome is a real phenomenon where seemingly young, healthy people can die mysteriously in their sleep. Survivors of the syndrome report a feeling of terror while being paralyzed in their bed as a shadowy figure attempts to grab or strangle them.
When a rash of sleep fatalities is reported on air by a struggling late night radio host, Dallas Robert (The Walking Dead, The Grey), a skeptical CDC investigator, Alison Eastwood, is called in to verify his claims. What they discover is a deadly, psychological condition where fear causes the shadow beings to appear.