How often does God visit you in your dreams?

Dead Ancestor visits sleeping man in dream.Karo tribe, Omo Region, Ethiopia

In my camp, these Karo-tribe elders told me: “Sleeping is like becoming dead. So when you sleep you have already died." During sleep their ancestors come in dreams to advise about every day events—like when to plant crops, as well as foretelling the future.
“Some believe that the person who talks to you in the dream is God."

How did they know it was God? That night in my backpacking tent, I read in Joseph Campbell's The Power of Myth and the Bible about higher beings visiting people in dreams throughout history.