Reference to Other Dreams and Settings

Now, I'm not one that can willingly control dreams as it usually is too real to think it's a dream even though you do freaking crazy things in them. But haven't you ever noticed how sometimes you revisit a setting while in your current dream. Of the times that this has happened, it's usually just a glimpse and nothing else. I would try to explore it again but I don't have the power to do so. Sometimes though you do get to visit it and explore, usually finding new things. Discuss on what this could possibly mean.

Also, can you actually remember the settings of some dreams? I remember one very clearly compared to others that I could draw it out but I have horrible mapping skills so it wouldn't be all that great.