I remember once at my cousins me and my bro were sleeping on the floor.

I remember having a dream were there were two random DCs and him. Me and the DCs started to walk away from him, and I turn around and see him about 20 feet away. He lifts his arm up as if he's about to start waving. At that exact moment I wake up and I'm facing my brother who's laying 4-5 feet away from me. He sleep talked saying "Hey guys, wait for me!" - and I'm sitting there thinking "no way... it can't be!?!" - so I start shaking him and he wakes up. I ask him what he was dreaming about - "uhh... I don't remember", damn! There were went my only chance for a validation

I think it's possible, though extremely rare, that two minds may somehow be able to communicate with each other. Will all the electric signals going off in our heads during dreaming, maybe even scientifically, the magnetic fields that are produced - can maybe be picked up by another brain, and translated back to electric signals. That wouldn't explain people having shared dreams that are miles apart though.