A snake that is kept as a pet, inside a house should not be able to get that cold to go in to "shut down" mode. What your temps and humidity in the snakes cage?
As for skipping a meal, I wouldn't worry about that. Snakes can go a very long time with out eating so one meal missed is nothing. As for the pupils, I've never seen any of my snakes pupils dilate, undulate. They just seem to stay how they were when I pulled that snake out. I wouldn't worry about it, since you dont hear of snakes having those kind of problems if there even is some kind of problem linked that that sort of thing with the eyes.