I thought the same thing. Either sleeping, or he had the most disgusting look of some type of contempt on his face. So typical of Clinton.
That wasnt contempt, it was concentration.
Must....resist, cannot....burst...into...flames.
It looks like he had dental work done and the gas hasn't worn off yet. They have flashed back to them a couple of times. Notice how far they are sitting apart, as compared to the rest of the Presidents and First Ladies.