This happens everyday! nothing out of the ordinary (unless of course, it's someone you know - then, it'll seem like a miracle, but in reality it's far from it)
i posted a thing about what happens when someone passes away and how they see a white tunnel or something very similar is just the brain shutting down - kinda like an old television. The heat returns back to the center thus giving it the tunnel illusion...
something way more spectacular has to occur for ppl to believe there is a place that the dead go... and that would require like I said, some spectacular.