just a few weeks ago, i ran across a thread or forum on this exact meme...i've looked at deoxy.org then at Paranormal.com....anyhow I had to ask
BOB->
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...and Bob says look
mind.ucsc.edu...
~~~
in there is some 'twins' dreaming stuff, and so-on...
me? yeah, the dream characters can be made manifest, thats a form of conjuring...are foreign bodies and persons invading your brain.?..they can and
do
BUT, all dream images are not trespassers or spies or thieves in your sleepy-time brain....most are only conjured mind realm entities, fashioned by
your own intellect , from the messages recieved from all the cells & organs & life support systems in your body...
'they' are constructs of cellular communication...in a 'language' you can understand or have interpreted.
(mostly fashioned by memoried chemical/neurological associations with emotions or other sensory inputs)
example: a real life experience of a dog woofing, in a drizzly, overcast day...could make 'meloncholy' the emotion/image/memory connection...then
when dreaming a furry bespeckled raccoon might dance, ala britany spears funk, the linkage & connections may be frazzled,,,but the emotional
'language translation' is there-- for a trained dream interperter to uncover with your help...ooops, take what you need and leave the rest, as the
saying goes
And you are concerned? about the SCANNERS and INTRUDERS?? or the images in general??
for different needs: Psychiatrists, Psychologists,Shamans,Exorcists::there are Specialists!
I've heard that the elders of gypsy tribes were able to "cross" physically (There was this one time
I awoke with a thin layer of dust on my body... that was odd!). I do understand that some dreams are just that, dreams... while others are more. I
have been known to astral travel, most of the time without consciously doing so (which is a strange thing, too... they say you cannot feel anything
when detatched from your body... NOT TRUE!) 
