How has dreaming survived our evolution?

English: Charles Darwin (1809-1882) in his lat...

English: Charles Darwin (1809-1882) in his later years. This image is flipped. Darwin’s mole was on the right side of his nose. (Photo credit: Wikipedia)

From an evolutionary standpoint, what might be the use of dreaming?

It seems like an energy drain to be firing off neurons in the brain for fun. It must have survived over two million years of natural selection for some reason. What might it be? Any thoughts?

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