Connection between the dream world and the "real" world?

I have always been fascinated by the fact that there is a connection between the dream world and the waking world - if it is not an inseparable whole - such as premonitory dreams or time travel. But I would like to go further and find out if any of you have experienced any serious connection between the 2 worlds, I once read about a person who brought an element from the dream world to the real world … I also read from people who they have connected the 2 realities in a multidimensional state of consciousness. I am also fascinated by the idea that two or more people connect in a dream, of which there are many experiences, and it is the evidence without any doubt that the worlds are intrinsically connected. Has anyone experienced something like this?