I think in it's entirety the term Dreaming or Dream-time has more to do with consciousness than dreams during sleep. However if you've ever travelled you'll know that spending time in a place will make that place enter your dreams. The original term has to do with awareness, wisdom passed through DNA and ways to express a strong connection with Nature from which all forms mysteriously arise.
I had a book once, a huge book written by an artist who lived with the aboriginal people for more than a year but it was a long time ago and destroyed in a flood, actually a hurricane when I lived on a house-boat. There were as many shocking facts in this book as humbling ones. Nevertheless, in a native culture as this one sometimes God is too great to be named or approached directly. There are many ways to worship and the spirit is shared by all.
The Dreaming is the passing of the living spirit for a tribe with no written language. It is a moment-to-moment practice and encompasses all aspects of life. This may seem strange to those familiar with organised religion who attend rituals or set time aside for contemplation. The Dreaming is ongoing all the time, before birth and after death.
Honestly it would take a thousand pages to even begin to do justice to the depth of the concepts involved. The Bible has an equivalent to the Dreamtime in that all beings were in harmony before the apple was tasted and God tossed them out of the garden. The Dreamtime is so no-one forgets the actual state of harmony which can be lost in the fog of survival and daily needs.
Here is a poem written by some Aboriginal children:
My culture is my identity.
Dreamtime stories tell the life of my people.
Hearing stories of my ancestors living off the land
Becoming one with the creatures
Even though I haven't met them
I feel this unbreakable connection
Through the stories I have heard.
The stories that have been passed down through generations.
These stories are living through us.
Without our culture we have no identity
And without our identity
We have nothing.