Please help! I have a black Australorp hen that seems to sleep all of the time. She does eat and stay hydrated but the bulk of the day is spent on the roost. If we bring her out of the pen, she'll peck around for a bit but then typically returns to the roost. She is blind in one eye but can see just fine with the other. We were told that they were all the same age when we purchased them in April but I am wondering if she is quite a bit older than stated. She does not lay eggs like the others and tends to stay off by herself. We've watched her enough to know that she does eat and drink fine and her poop is normal. I'm completely clueless as to why she wants to sleep so much. Any advice would be greatly appreciated!