I had previously posted about an incident where I did not attain lucidity inside a dream inspite of RC. The dream just turned black.

http://www.dreamviews.com/f12/why-di...1/#post1900603

It happened for a second time today. And this time I was carefully analyzing what happened and this is what happened both the times:
The minute I do an RC in a dream, and I realize that it is a dream, I start getting excited. And the excitement hinders the dream state in which you are totally relaxed.
The dream turns black, even your mind becomes blank and you feel like opening your eyes.

What do you guys think ? Have you had this problem ?