Is there some scripture reference to dream yoga? By dream yoga I mean the practices intended to attain lucid dreaming, and then using that ability to realize that the world as we know does not exists as perceived (as in a dream) so one can reach the fully awake condition.
This depends somewhat on how you define "scripture." It's important to emphasize that "scripture" to a Buddhist doesn't necessarily mean the same thing as "scripture" to a Protestant Christian, despite the similar language. 

As Rabbit references there is a document titled the Six Yogas of Nāropa (ན་རོ་ཆོས་དྲུག་, Narö chö druk).  Naropa himself was no small figure, at least for certain traditions, and a lot of the teachings in the Six Yogas are widely practiced among certain sects. 

That, by itself, might count as a "scriptural reference" if that's what you are going for. This has been taught as stemming from the Gautama Buddha's statements about the illusory or dream-like nature of reality. It is an established document that is well known. 

On the other hand, as far as I can tell it isn't listed–at least commonly–as part of the Tibetan Buddhist canon or any of the other major canons. That having been said, there are a great many Buddhist texts that cover a wide variety of different practices that are not found in in those specific texts that doesn't lessen their value. 

So the question comes down to what, exactly, you consider "scripture" and why you are looking to know.