The Pineal gland, its a small gland in the center of your brain. When you get into the relaxed state and start drifting off to sleep then it releases a chemical called DMT or dymethyl-tryptomine (I'm pretty sure that's how its spelled.) it is a powerful hallucinogenic causing your memories, thoughts, emotions, or whatever is on your min manifest into a situation, or image. Dreams are largely symbolic, but most of the time (if not all of the time.) have deeper meanings, or teachings that can help you in your life.
cereblum
the pituitary gland
i would think that it means you are either moaning about your weight to much and your brain is now sending these so to say messages to your body which made you dream
No. Because they do not have a brain.
No. The brain is made of nerve cells. And the nerve cells in the brain are part of the central nervous system that does not regenerate.
The skeleton does not hold any memories. Your brain holds memories. Your brain is inside a brain case made of bone.
cerebrum
The one called only The Dream is from 1931 (Cleveland Art Museum). He made other paintings with the word dream as part of the title.
anyone with a brain will
Uh... what? I'm not sure what to make of this question, but I'll try to answer it assuming it's meant literally. Our brains are made of atoms, but they are not the same atoms that were part of Albert Einstein's brain. Unless you have been eating parts of Albert Einstein's brain during your own brain development, none of the atoms that were part of Einstein's brain are a part of yours. Even if they were, that wouldn't make any difference as far as making you "smarter".
The brain stem.
The main part is the brain, made of mostly water, and the spinal cord, which is made of bone.