How does coincidence works?

Has anyone ever figured out how the coincidences work? Ever?

I mean many times I’ve witnessed coincidental events but instead of understanding the occurrence I was awestrucked. I would like to quote today’s incident. My son was watching YouTube when all of a sudden he selected to play a video, which had the title’ has a ghost appeared in your dreams, ever?’

At the same time, while going through my emails, title of an email caught my attention. It read, ‘Do ghosts try to communicate through dreams?’ Some of you may question, ‘so what’s the big deal? It does happens. ‘ But it is some sort of indication or is it? Because few days ago I had witnessed two people sitting on a chair placed in my bedroom. Though it was during night, yet I swear, it was not a dream. My eyes were open and I tried to adjust my vision but was not successful. And I struggled to shout but my voice was strangled l, at least I felt that way. Then atlast a small but deep sound escaped my throat. Then everything was back to normalcy.

Then yesterday when my daughter was watching YouTube, same video had appeared on her playlist and when she had tried to watch, it didn’t play. But today it did and created a coincidence with my email.

So, I can say that this topic is haunting me from last four days. But why? That is the point to ponder.

But with this another question is left unanswered, actually, the main question. Do ghosts aka spirits try to talk to us through dreams? And for doing so do they need to be related to us in one or the other way?