According to biochemical and physiology research done by Hobsin and McCarly, dreams are the result of chemicals in the brain that cause neurons to fire. In the research they use cats because cats have the same sleeping activity that human have. In dreams brain tells the body to move but the messages do not transfer to the body, do no movement is initiated. About the content of the dreams can be explained just using the activation-synthesis theory. For example if you are trying to escape from something, the brain receive a message to run, but the legs don't response. And based on that theory there is no hidden meaning on our dream and there is nothing to do with the unfulfilled desires. dream is just a chemical response to brain cells.
The biochemical and physiology research is very different from what Freud has identified. According to Freud a dream is a symbolic image about our unfulfilled desires while it is not the case by the Hobsin and McCarly research.
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