Corridor in Dreams of Infinite Horror

Everyone must have had a dream. So let me ask you a question, when we dream, are we in the dream or outside the dream? Maybe someone else is definitely the person in the dream, because it is my own dream. Some people say that they are dreamers, because every time they dream, they are watching from a God's perspective. Whether it is the person in the dream or the person outside the dream, please think about a question, is the self in the dream still the same?