If and when does consciousness disappear? What happens during sleep? By wearing/wiring electrodes to his head, Marcus de Sautoy, utilizes the TMS device, which discharges a series of electrical shocks, in order to determine how active the brain is while we are sleeping. What changes did he find? When awake, areas far from the stimulated area are prompted, which allows us to conclude that the brain is an interacting network of interconnected elements. During sleep, however, the stimulated areas remain local to the shock origin. The brain works in an active/reactive fashion in both instances, but while sleeping the activated area is isolated in the "zap zone" in comparison to the effect a stimulation has during consciousness which disperses responses throughout the brain. The latter, indicates that a conscious brain is very much integrated via networking, diversity and unity simultaneously. The unconscious brain on the other hand, shuts down and does not have an active relationship with the rest of itself. I found this segment to be most intriguing due to the vibe I received initially while watching. To me, the makers of this film led me to believe that the brain was not active during sleep, even though it is. But I learned it is inactive in the sense that it is not having a conversation with other parts of the brain as it would during a state of non-rest.