Here is a fascinating documentary about dreams, "BBC Horizon: Why do we sleep?" I think it was made very recently because it contained a lot of new scientific information about sleep which I'd never heard before, such as that it turns out that we actually do dream in non-REM sleep as well as in REM sleep.
Near the end, a sleep researcher makes the comment that there is little difference between dreaming and our waking states in actuality--which is something Buddhist masters have said for a long time. Check it out.
http://www.youtube.com/watch?v=0r1PUoG3 ... re=related
http://www.youtube.com/watch?v=pYDsCGcb ... re=related
http://www.youtube.com/watch?v=zPce10ym ... re=related
Casual conversation between friends. Anything goes (almost).
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To add.....did you know animals, cats and dogs certainly dream?
"This order considers that progress can be achieved more rapidly during a single month of self-transformation through terrifying conditions in rough terrain and in "the abode of harmful forces" than through meditating for a period of three years in towns and monasteries"....Takpo Tashi Namgyal.