I've just moved halfway across the world with my two cats in a 25hr journey that included two flights, the last one being a 15hr flight. One cat is absolutely fine, but the other one is quite stressed after the experience. I've placed them both in a secluded area with food, water, Feliway and other anti-stress items, and while they are both eating and drinking fine, the stressed cat is mostly lying down on the ground and is not going to the litter box after 24 hrs of arrival. He is also keeping quite, not vocalising much. Obvious first question is, should I be worried? Second question is, what do I do so that the kitty does his business? I brought some of their litter along, even a little bit of their old used litter so that they would feel more at home in the new box...any help is greatly appreciated!!