 Olivia and Peter learn Greg was being treated for a sleep disorder, and that his dreams had involved demons until they stopped several months ago. Another hallucinating victim turns up in Seattle and dies. The Fringe team discover that both victims had a brain – computer interface chip attached to their thalamus, the part of the brain controlling dreams. Broyles (Lance Reddick) and Nina (Blair Brown) reveal new information leading to the sleep researcher Dr. Nayak (Ravi Kapoor) who implanted the chips. Another victim named Diana (Jovanna Huguet) hallucinates at a restaurant and kills a coworker before similarly dying of exhaustion.
