It is actually really hard for me to do reality checks, even though I'm quite conscience and understand that it IS a dream...It is as if my mind refuses to allow me to do reality checks. Recently I had a dream where my floor-mates and I were arguing over who gets to take what part of Italy. When I realized that we were all out proportion and in a room I'd never seen before I became AWARE that this wasn't real...but continued to accept it as thus.

I'd suppose that for some people that come to realize that they are in a dream, but aren't familiar with the concept of a reality check, their experiences would be similar to mine in many ways.