When we close our eyes, we still sense all our surroundings; this is because we live in a virtual reality inside our mind. Our raw sensory input would be overwhelming and confusing, so we filter and process it into our own private 3D film, with surround sound. These internal constructs are really the only way we interact with the “real” world. The reason our dreams seem so real is that the same “hardware” we use to process what happens around us can be run as a simulator during our downtime.
