It is a fact that if an impulse from one or the other sphere comes up and is not lived out, then it goes back down and tends to develop anti-human qualities. What should have been a human impulse becomes a tiger-like impulse. For instance, a man has a feeling impulse to say something positive to someone and he blocks it off through some inhibition. He might then dream that he had a spontaneous feeling impulse on the level of a child and his conscious purpose had smashed it. The human is still there, but as a hurt child. Should he do that habitually for five years, he would no longer dream of a child who had been hurt but of a zoo full of raging wild animals in a cage. An impulse which is driven back loads up with energy and becomes inhuman. This fact, according to Dr. Jung, demonstrates the independent existence of unconscious.
Marie-Louise von Franz, The Psychological Meaning of Redemption Motifs in Fairytales
dreaming, impulse, jung, unconscious-depth-psychology