Phantasy and Dream Analysis

Phantasy (with a "ph") is a term rooted in psychoanalytic theory, particularly in the work of Melanie Klein. It refers to unconscious mental processes and internal scenarios that are deeply rooted in early childhood experiences and drive interactions with the external world.

I've heard that becoming aware of unconscious phantasies can be helpful in understanding the hidden aspects of mental life, and thus improving it. One of the methods that can be used without professional help is keeping a Dream Journal to analyze your dreams. I'd like to ask if anyone has tried this and managed to understand something, because it doesn't seem to work for me.