Oh, so they didn't leave their home.

Maybe they are particular about when they're fed. A change in feeding schedule could stress them as well. It would depend on what time of day you set out their food.

I feed mine at 6pm. They get up, snack and go back to bed till around 10pm. If I have to leave before it's time to feed them I will put dishes in the cage frozen so it stays more fresh by their feeding time.

I don't know if any of that helps, but if they are hungry, they will eat.