I’ve had Sherman for almost 4 years, he will be 4 on Christmas Eve. Today he started acting strange. He was laying on his side in the middle of his cage, which is extremely unlike him, he usually snuggles with his blanket. I was worried he was cold so I now have him in his blanket on my chest, but he is making weird almost like clicking sounds when he breathes. Does anyone know what this could possibly be??