Dreams seem to say things that we cannot even express ourselves. Places, people, objects, intertwine in an incomprehensible way we could never have imagined. Sometimes we feel like we have known this "over-reality" once.
The ancient inhabitants of America urged children to remember as much as they dreamed, because they believed that a part of the soul leaves the body when we dream. According to them, each person has three souls; the first is the spirit of the ego, which gives us the spirit; the second is the soul of the body, which gives the organism energy when we are awake while the other, the free spirit.
The free spirit, they said, leaves the body when we dream. This part of the soul is capable of traveling to other dimensions, while the other two stay in the body. Native Americans believed that the body does not dream, our mind; it is the free soul that breaks into a completely different reality, where it encounters other souls of people and other living things.
According to this belief there are other dimensions at the same time, which communicate with us through dreams. The free spirit strives through the dream to warn us, to advise us, to tell us something that will or will happen.
Modern thought explains dreams as a way of the brain to expose the thoughts and memories of the unconscious, which to some extent meets the belief of the ancient Americans. Neither have psychologists been able to definitively define what the mind is, so such as Gustav Jung combine psychology with spirituality.
Either way, dreams reveal an unknown dimension of ourselves, no matter what we call it: "consciousness" or "spirit."