Why do I have such strange dreams? Do they mean something?

Some dreams do, some don't. The only possible meaning in my opinion would be psychological. Something your brain might be trying to tell you! I have looked into this once or twice in the past, though it has been a while. From personal experience I can tell that often times I see things I think about a lot. Things that I really want to do, people I really want to be around. Of course there are some dreams who feel [and are] complete nonsense your brain cooks up while you're sleeping. They make for great laughs if nothing more or less!