A premonition of one's death

I wonder who and why a person warns about his death. The following reasons for this phenomenon are possible.
Suppose that this death sends us these signals. If this were so, it would be common for all people on earth. And in fact, not many people predict death. I wonder why very often people die in a dream and in the morning. Perhaps this is a courage about nobility in relation to, for example, heroes, so to speak, death services at the highest level, reporting on their arrival. Very difficult and not logical. And maybe this is based on our ancestors and the connection with them does exist. What are the only legendary stories about the ghosts of deceased relatives. For example, let's take the legend of the "white lady". This family phantom, for centuries warned by his appearance the death of someone from the royal family of the Prussian kings of the Hohenzollers. And as you are such an option dead relatives are worried about you, prepare you for death. After all, their souls fly around us. We are satisfied with such an act of tranquility. We know many stories about relatives "from the other world" who come to already hopelessly sick people and it usually happens at night. They come for the speedy meeting in heaven. As one of the options - this is a warning about the deadly danger, although death comes and for natural reasons, as a result of aging.
Our world is interesting. And so many mysterious things in it.

images from here