Can two people have the same dream? Can they meet in a dream?
So far, there are no credible scientific sources that would confirm this. But there are many cases described. Dreams can appear in couples, family members, and friends. Many such situations have happened with twins. Single cases concern completely strangers who found out about this fact after. They ran into each other and recognized that they had already seen each other - in a dream
Example of a common dream of a Reddit user named Akeleie:
I dreamed that I was at my house looking out into the woods outside. My classmate was standing there looking at me. The next day at school, he came up to me and told me about his dream from last night. He dreamed that he was standing in the forest. In front of the house where he saw me looking at him through the window. I hadn't told anyone about this dream before until he told me his.
Collective Awareness And Quantum Connection
According to Jung, during sleep, we can contact not only our own but also the collective unconscious. His theory is that during sleep, we have access to a more extensive system, common to all people, but unaware. Can understand it as a universal library of dream symbols, places, and events, or as a dimension accessible only to the mind. And if so, why not two different people 'borrow' the same 'movie' from it, or be in one place?
Another theory that may bring us closer to understanding this phenomenon is quantum entanglement. In the simplest terms, it concerns two photons/objects that, as a result of connecting, can interact with each other regardless of the distance and time between them. Entanglement contradicts Einstein's theory that items cannot travel faster than light. Their interaction occurs without traversing the space between them. Scientists have already observed entanglement between photons separated by several or even 144 km.
Assuming that consciousness obeys the same quantum mechanics principles that affect photons (see Roger Penrose's model of quantum consciousness), why not get entangled with another consciousness and interact with itself in the space we perceive as a dream?
To put it another way: as Moby sang, we are all made of stars - reduced to the quantum level, all matter in the universe is just dust from the stars. If we come from one and we are part of one, perhaps on some as-yet-undefined level, we go back to that connection… and we left with only dreams (for now)