About eight hours before my father died he was having a conversation with his unseen mother, who died when he was 14.
I asked him "Who are you talking to?" and got a rather rude response, not like him, "My mother" in a tone you give a five year old "go away kid you are bothering me".
The International Association for Near-Death Studies (IANDS) is worth checking out if you have interest. I've never had a NDE, however I've spent a lot of time in their library in Durham North Carolina.