This can also be called HI, or hypnagogic/hallucinatory imagery. (Or HH, hypnagogic hallucinations.) And yes, I know for a fact that you will be able to find many people on this forum who can discuss HI with you! (Unfortunately I myself a not too knowledgable on this topic.)

http://www.dreamviews.com/community/...ad.php?t=65425 That's a tutorial on the very topic you are talking about! I hope you use your HH knowledge to have good discussions and to contribute your insight. Have fun on DV.
~Spockman