In the story of Romeo and Juliet, one character calls dreams “The children of an idle brain”. I understand dreams to be images and thoughts coming into our heads while we sleep.
They may or may not come true in real life, but usually if they come true it may not be the full dream. I do remember having a dream that I felt like came to life. I do not remember the exact dream or what happened, but I know that when it happened it felt weird. I felt like I went back in time and re-lived this moment. Kind of like having deja vu, but you know what it is from.
Some parts from the dream did come true, but not all parts. I do not think the dream changed my behavior because in my dream I was acting the same I would have in real life. Dreams, I feel like, do not change people’s behavior. Dreams just put people in a situation that may not happen in real life.
I believe our dreams can teach us things. Depending on they try of dream it they can teach us a load of different things. For example, if you have a dream about being in the woods alone, it can teach you survival tactics and things like that. I can not recall a dream that helped me understand something, but I am sure that there was a dream that helped me.