A site I found says......The Tibetan adepts mastered the lucid dream state and used them as a means to realising that all things perceived through the senses are illusory and that the only reality is Nirvana. "The Universal Creation, with its many mansions of existence, from the lowest to the highest Buddha paradise, and every phenomenal thing therein... are but the content of the Supreme Dream."

I think it's alot for a normal person to 'percieve'. I tried doing that but the mind went slightly schizo....

From this site...http://www.psychics.co.uk/dreams/luciddreams.html

IMJ