What Do You Think Of Dreams?

Do you feel dreams have any use or do you feel they are generally just meaningless? I have had all kinds of different dreams and although I've never given it much thought I do tend to wonder if they are trying to tell me something, if my brain is trying to tell me something, and if they affect my life when I'm awake. What about dreams you don't remember? We all dream at night but only remember a fraction of them. Do you believe they affect us if we don't remember them? In general, if something happens to us and we don't remember, does it matter? Thanks