It's possible, but I doubt it happens that often. You're probably better off demanding certain answers from said DCs (and thus your subconcious). Such as,

"How do I get incredibly vivid dreams?" or
"How do I get nice, long lucid dreams?" or even
"How do I learn to control everything?"

You might get some good insight, you might not. I'm surprised everyone doesn't do this. Who knows how your mind works better than.... your mind?