When park employees work with hosts, they are put into a fugue-state where their software is exposed. They can be examined, interrogated, modified, and repaired in this mode. It is very much like how a human would act if hypnotized. When asked, hosts describe it as a dream. This is an important metaphor to remember in a story where dreams, night, and unconsciousness are all linked. Humans turn host consciousness off in this diagnostic mode.