I wondered this aloud with a psychic clairvoyant recently, who offered the thought that our spiritual perceptions are probably confined to this planet.  This makes sense to me, although I have read of 'remote viewing' of targets on Mars, for instance.  If we are capable of ESP, but that it is confined largely to Earth, then a dream of the Dark Star, if it means anything at all, may allude to a memory held by our species within its collective unconscious.  The Dreamer way inadvertently access a memory of the previous transit of Nibiru, an event observed from Earth by ancient peoples. (I am given to understand that Zecharia Sitchin now dates the last perihelion transit to around 600BCE).

If such a mode of thought is correct, and I am not advocating it without pause for thought, then such a profound unconscious memory may also be accessible by other methods.  Artists, writers, musicians; these people often transcend normal functioning to deliver us creative visions from within.  In many cases these creative folk access this kind of deep-seated material through the use of drugs.  A good example of which would be the Grateful Dead. Again, I'm not advocating this as good practice, but merely reflecting upon the experiences of others.

Erik Johnson, of North Carolina, sent me some wonderful pieces of Grateful Dead artwork which may have Dark Star connotations.  I particularly like the juxtaposition of the Winged Disc and central Sun in the first image (top), with the skull and crossbones of the Dead hinting at disaster. 

Note the Winged Disk symbolism associated with lightning and a skull in this motif.  The Winged Disk is often associated with the life-giving sun; but not here. Instead, the winged skull is enveloped in darkness.   It seems to embody something altogether more sinister.  This possibility seems all the more likely when one considers the classic grateful Dead song "Dark Star" itself, some of the lyrics of which I reproduce here to provide some critical insight into such a possibility:

Dark Star crashes pouring its light into ashes
 

Reason tatters the forces tear loose from the axis
 

Searchlight casting for faults in the clouds of delusion
 

Shall we go, you and I, while we can?

Through the transitive nightfall of diamonds

(Words by Robert Hunter; music by Garcia, Kreutzmann, Lesh, McKernan, and Weir)
 

Now, I'm not about to try to psycho-analyse these lyrics.  But they are quite suggestive of the celestial Dark Star, and the potential for catastrophe brought with it.  Although I've seen the band a couple of times, back in the late 1980s, I can't admit to being particularly well-informed about their work.  The following link has more information about this song, as well as some interesting source material about the term Dark Star (although possibly a little out of date now...):

http://arts.ucsc.edu:16080/gdead/agdl/darkstar.html