Quote Originally Posted by slash112 View Post
To be honest, all it really takes is to question whether you are dreaming or not.
That doesn't work for me... Mostly I get so caught up in the dream that it always surprises me when I figure it out.

Another idea is to think of what you did before now and to question whether it makes sense logically that you are where you are now.
If the scene has changed and you don't know how you came from one place to the other, most likely you are dreaming -- or really, really hung over