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There are two main theories about why dreams occur.
(Explained in computing terms)
First is scheduled maintenance.
Your brain essentially runs a defrag when you dream, trimming useless information. Most times, you forget about the dream, but other times you'll wonder why you recalled that memory from 15 years ago. Your brain needs to inspect the file before sending it to the trash, but you managed to recover it before it got zeroed (unrecoverable).
Second is threat model assessment.
Your brain is randomly compiling memories while you dream, scanning for useful information. Sometimes a certain combination will leave a strong impression, which gets cached (saved to RAM). These memories are usually bad, and get saved to disk because we're slow at debugging, but are invested in fixing it to avoid a kernel panic (blue screen). We spend so much time thinking about it, that the bad memory's directory gets added to $PATH(bookmarked)
Sleep is where the multiverses meet, man.