Ok, so i've heard posted here and there about 'Dream Guides', and how people have 'met' them in their LD's.

What I want to know is basically, what exactly is a dream guide?
-Does it talk?
-Can it interact with you?
-Why do you all keep talking about it?

And most importantly, since DG's seem to be an important aspect of all of your LD's, i'd just like to know:

"Has anybody met their Dream Guide BEFORE hearing/reading about Dream Guides on the forums or anywhere else, or has everybody heard about them first, THEN gone on to meet theirs?"