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Everyone has, at one time or another, experienced how dreams can influence our moods and actions. However, putting an idea in somebody else’s head while they are dreaming in order to make them do something specific once they wake up is still the stuff of science fiction. In the 2010 movie “Inception,” Leonardo di Caprio’s character tries to get the heir of a wealthy businessman to break up his father’s empire. To do so, he shares a dream with the heir, in which through clever manipulation, the heir’s convictions about his father are subtly altered, leading him to abandon his late father’s business.

While sharing dreams and planting s...