Theoretically, when you dream the dead visit in dreams, they don’t. There are other reasons why you dream of the dead. This book talks about how you can interpret dreams on dead people.
Update on Dec. 16 2023:
David Yoon is a bestselling writer, publisher and producer. He wrote a newspaper article entitled “Learning to spend on love”, which was published in The New York Times International Edition, on Saturday – Sunday, December 16 – 17, 2023. He related how his Mom often dreamed of his deceased Dad. David’s Dad asked his Mom when is her estimated time of arrival (ETA). The widow replied that she would join him soon.
David’s parents are Korean.