Rolf and Joe wrap up their 3-part series on dreaming with Finnish neuroscientist and philosopher Antti Revonsuo. Dr. Revonsuo is the originator of the Threat Simulation theory of dreams, which suggests that dreams are simulated worlds in which we may practice threatening situations. Topics include the history and methodology in dream research, how our brains create simulated worlds, the particular nature of the simulated dream world, and how this applies to waking consciousness. We base our discussion on three forthcoming papers: Revonsuo, A. (in press) Toward a Metaphysics of Consciousness: Science and the Fundamental Nature of Subjective Experience. To appear in The Scientific Study of Consciousness: Experimental and Theoretical Approaches. (Springer Nature). Revonsuo, A. & Tuominen, J. (in press) The Concept of Dreaming as a World. To appear in Threshold Worlds (Oxford University Press). Revonsuo, A., Valli, K., & Tuominen, J. (in preparation) Evolutionary Simulation Theories of Dreaming.