See Here: Dreams VS Reality
Reality check is called that for a reason. It brings you face to face with what things actually are like and how different it is from what you imagine it to be. Say for the fantasies that you have when you think of a girls stay over, you imagine it to be all about pillow fights and girly fun, but it really is all about movies and popcorn and gossip. Sometimes you even think of fantasies regarding your teachers but it really is more about the teacher yelling at you for the homework not done. Here is a compilation of such images which will connect you to your fantasies and then bring you back to the real world. Check it out.