Sarah, 18, ran away from home and now spends the night in the open air on the playground. Every night she dreams of strange, frightening images, so when a girl sees an announcement from the Institute for the Study of Dream about recruiting volunteers, she grabs the opportunity. The subjects' bodies are covered with sensors, and after the first night, Sarah feels rested, but when the researchers show her vaguely recognizable black and white pictures, the girl begins a seizure.