I don't know if this has been thought of but I came up with an idea about why we see dreams after one of them. You know the general idea is you see dreams because we try to keep our memories of what has happened in our lives. But in my recent dream I've seen I've been going to my course but it was not where it's supposed to be. And I thought in my dream it was where I used to go for learning. So how come do I try to keep my memories in this situation? Our brain just shows us what it wants to show, not reality.

So after a while seeing this dream I came up with this idea that maybe we dream because we make rehearsals of how to react to current life situations. We try to be prepared for the next event. After my dream this makes more sense to me.