I believe they are part of the sub Conscience mind and memories .

This is what I believe: All dreams have meaning. Some represent our own thoughts and feelings, including elements in our subconscious, whereas others represent recollections of our experiences in higher planes, possibly with other people, while our bodies sleep at night. That's why dream interpretation is such a tricky subject. I'd say, if you have the sincere intent to understand your dream's meaning, your intuition may give you the answer.