What do dreams mean?

I don't mean this in the sense of "if I have a sex dream that involves my mother, does that mean I am attracted to my mother?", I know that dreams aren't a literal representation of our desires in that sense.

What I mean more is, is there any study or anything that has been done to see if a dream's content indicates anything about what problem the brain is trying to work out?

Like does a dream about sex indicate that a certain lobe in the brain is particularly active at that moment?

Or like I have had negative dreams that cause me to feel anxiety when I wake up that involve my family or where I was in the middle of an ICE raid recently, does that indicate anything in particular about what my brain was doing while I was asleep that caused me to feel anxiety and that happened to manifest as ICE raids?

not sure if this was the right sub for this question.