Sorry I shoulda been a bit more specific
When you were in your dreams what were your feelings, to me so far all I am seeing is pretty much normal dream stuff, you don't say whether you have ever ridden a horse, or whether you know anyone russian or indeed whether you are lesbian...sorry I know that last one is a bit personal but I hope you understand what I'm getting at, I have only had a couple of hours sleep last night so Im not working with all my cylinders going today!!
Was there any thing in particular that jumped out at you more than the rest of it?...Feelings are a big part of my dream work, dreams to me cannot be solved correctly using a dream interpretation book as people view different objects in different ways...for instance the horse in your dream? Some people would be terrified about being close to or riding a horse, some people would love it...and some people have memories linked to riding a horse, the same goes for everything that shows up in a dream.
With me if I dream of a house I know that the house is me...it may be different with someone else but I am a house!...I have also had dreams about being in a school and these are linked to lessons I need to learn, like being honest with yourself, being over reliant on others or not enough that kinda thing.
The brain thing? when you think about a brain what comes to mind?(lol couldn't word that any other way!) Once you know think about your actions...you were taking it in...then you got side tracked.
So think about your actions in you dreams, your moods and feelings, colours, "random" objects etc.
I have different kinds of dream, I have message dreams, I have learning dreams, I have past life dreams, I have sick and disturbing "dealing with inner demon" kinda dreams and I have the normal completely daft dreams.
Everyone is different...remember that
You mentioned that you had four dreams but you have only mentioned three of them?
I hope that this has been of some help?

Anyway I have rambled on enough, please feel free to PM me if you need me to clarify what I said...Im hoping it makes sense lol...I need SLEEP!!!