There are so many theories about this. It used to be thought of for a long time (Sigmund Freud was a big fan of this theory) that we use dreaming to express our unconscious desires. THings we can’t or shouldn’t do in reality can be acted out in your brain at night, without harming you or anyone else. We actually know so much more about it now but nobody agrees exactly on exactly why we area. Check out this brief clip by a hero of mine that speaks about this more:
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