Wasn't there some kind of remark in the movie about keeping Jason out of sunlight? Also, Jason had to use an inhaler. You might almost get the impression that Lois was going a little "Munchhausen by proxy" on him. From my take on the movie I got the impression that Lois suspected in the back of her mind that Jason was Supes' son, but until the piano incident had no confirmation. Her lack of reaction read to me as being more in a state of shock (or just poor acting). Later, when she asks him to open the door, it seemed to me that he was just not up to it. Maybe he used up all his reserves on the piano.
Yep, still awake here too.