Hi,
So finally its Thursday and I back here to reveal the answer. Before I do that I must tell you the difference between watch and see. Which is "Watch" is used for moving objects and "See" for stationary objects. Dats why "Watching a Movie" is used instead of "Seeing a Movie" coz movie is a moving object.
That is why all those who gave the answer as "EYELIDS" didn't hit the mark. The Correct answer is "DREAM" coz when "Watch a dream" we cant see anything else. And when we see something we cant watch a dream.