Laurel Gervais wakes up to her roommate knocking frantically on her bedroom door, insisting she be allowed inside. Standing in the middle of her bed, Laurel takes in a scene of destruction; shredded sheets, unhinged curtains and feathers floating aimlessly all around her. She had done this and yet, she had no memory of it. Discovering she'd suffered from night terrors as a child Laurel quickly books a sleep study in the hopes of coming up with strategies to cope with her sudden and violent reactions. The Salter Square sleep clinic comes highly recommended to help people suffering from sleep disorders, but instead of helping, Laurel can't help but feel trapped. With ancient architecture and strange design, this place frightens more than it soothes. A group of patients booked for a sleep study that very night are about to discover just how terrifying this place truly is. When a threat appears, Laurel must let down her guard and is forced to trust strangers with her life.