For example, if you dream about your first love, it means that you still have some attachment to it.
Dreams are created by human subconscious.
A girl dreams that you and another boy are playing dead bodies, which shows that she is deeply impressed with you two. For example, people are deeply impressed by the last two people they meet before going to bed, and often that person's subconscious will make that person reflect in his dream.
Sometimes, you have a dream and suddenly wake up, but you want the dream to continue, and you go back to sleep. As a result, you may continue to have the last dream.