I'm not exactly sure what is going on with my little buff orpington rooster. He is about 7 weeks old. He sits around and closes his eyes as if he is sleeping and today I noticed him tucking his head under one of his wings. I have watched and he is still eating and drinking water. I have him with 10 other chickens his age and they all seem ok. This has been going on for a couple days. Does anyone have a clue what could be going on?