The findings suggest that the moment when Dorothy passes out of monochrome Kansas and awakes in Technicolor Oz may have had more significance for our subconscious than we literally ever dreamed of.
Eva Murzyn, a psychology student at Dundee University who carried out the study, said: "It is a fascinating hypothesis.
"It suggests there could be a critical period in our childhood when watching films has a big impact on the way dreams are formed.
"What is even more interesting is that before the advent of black and white television all the evidence suggests we were dreaming in colour."
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