Peter

That's about what I was going to say, but I phrased it as "dreams sometimes reveal things about your life". I'm sure there are good examples of not realising how worried you are about something before it came up in a dream. But I think "random mishmash of stuff you already know" is more common.

Or to put it more positively, if something about a dream bothers you, it's worth thinking about what it is. But it's not worth examining every facet of a dream and assuming they all have to reveal something.