One of my hens (white leghorn) has become very lethargic and lifeless this week. She basically just stands with her eyes closed, not moving much at all. Her breathing doesn't look labored but her nose looks a little wet. It looks like narcolepsy. Not sure if chickens get that. Any ideas? A few weeks ago one of my hens had CRD and I had to put her down. Could this be related to that? This leghorn is not exhibiting any of the symptoms my other bird had so I don't think it's related but what do I know.