It has the extra coincidence of the death.
But as it is very common to dream of deaths, some such dreams must occasionally hit the target.
Other examples might be given of shared dreams: {5b} they are only mentioned here to prove that all the _waking_ experiences of things ghostly, such as visions of the absent and of the dead, and of the non-existent, are familiar, and may even be common simultaneously to several persons, in _sleep_.

That men may sleep without being aware of it, even while walking abroad; that we may drift, while we think ourselves awake, into a semi-somnolent state for a period of time perhaps almost imperceptible is certain enough.

Now, the peculiarity of sleep is to expand or contract time, as we may choose to put the case.

Alfred Maury, the well-known writer on Greek religion, dreamed a long, vivid dream of the Reign of Terror, of his own trial before a Revolutionary Tribunal, and of his execution, in the moment of time during which he was awakened by the accidental fall of a rod in the canopy of his bed, which touched him on the neck.

Thus even a prolonged interview with a ghost may _conceivably_ be, in real time, a less than momentary dream occupying an imperceptible tenth of a second of somnolence, the sleeper not realising that he has been asleep.
Mark Twain, who is seriously interested in these subjects, has published an experience illustrative of such possibilities.