teaching

How does one motivate their students? No matter how excited I am in regards to a topic the class seems to just sit and stare at me with blank faces. I think that a part of it has to do with the time of day which i teach, 9 am is not ideal. I'm not a morning person either, but I get up and do it and try to have fun with it. And yet they do not get into it. What can one do?