I do not believe my dreams mean anything special. I've had very odd ones that made no sense, while also one where it felt like a normal day. It usually involves what I have recently talk about, seen, or heard.
Our dreams' weirdness might be why we have them, argues new AI-inspired theory of dreaming. Why we dream is a divisive topic within the scientific community, and the neuroscience field is saturated with hypotheses. Inspired by techniques used to train deep neural networks, a neuroscience researcher argues for a new theory of dreams: the overfitted brain hypothesis. The hypothesis suggests that the strangeness of our dreams serves to help our brains better generalize our day-to-day experiences. Source 7c.
I suspect that dreams are more likely a by-product of other features of our brain and its activity than a function in itself. Do I know that for sure. No. Can I prove that? Of course not. My main reason for being skeptical of dreams' having an important function (Except perhaps as a byproduct of the brain's rest cycle) is that people who don't have them don't appear to suffer any sort of deficiency apart from perhaps disturbed sleep cycles. If you want to find out what something does, pull it out and see what changes!