Very interesting topic to think about!
I think dreams could be a way our subconscious gives us fantasy entertainment of things we would like to do. Like flying or winning a game or getting a partner we'd like to be with. Also it warns us and shows us how things that we're afraid of could turn out if we don't do something to stop them. I do think it's all in the mind, something that the brain creates, but I do respect anybody who thinks that it might be something from the spirit world. No one really knows!
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