There’s a supernatural explanation to the medical condition of sleep paralysis in this horror meller, reports Variety.

Dr. Alice Arnolds (Q) is an expert in the field of sleep infirmities, working at an institution dedicated to their study and treatment. She didn’t arrive at this speciality by accident — as a child she witnessed her brother’s death while sleepwalking, purportedly under the influence of a malevolent “imaginary friend.” Now she has an occasionally sleep-troubled young daughter to worry about, as well as her own episodes of nightmare and somnambulation.