Yesterday our 2 1/2 year old Plymouth Barred hen sat on a roost all day and evening. She was fluffed up, lethargic, her head tucked back in her feathers. She would not come eat or even move off the roost. She has always been our puppy dog hen - coming to her name, active, very sociable. Right before dusk I noticed her eyes looked blank and glazed over as well. I could find no injuries and her vent was clean. I worried all night that she would be gone in the morning. This morning I was shocked, but very very happy to see her walking around like normal. She is free ranging with the others right now scratching and roaming like nothing is or was ever wrong. I'm totally baffled over this. Any ideas?