There's no way to know what got through to his subconscious, or maybe the dream just finally ran its course. Whatever it was, Sam went still, limp as a wet noodle. He was completely still, save the shallow rise and fall of his chest.
A few moments passed, and then he was surging up, gasping for breath, eyes wide and unable to focus. His heart raced, and every pulse point throbbed madly against the sudden wave of consciousness.
"Dean?" He called out, eyes trying to focus, trying to find his brother.