About a month ago my hens laying slowed quite a bit, I thought they were entering a molt or the change in seasons may have been been the cause. But last night I realized that when I had built their new pens, I had moved them to the other side of the shed & there is a mercury light on that side of the building. It stays on all night long. The coop has a roof over it that casts a shadow for them but they still can see a large part of the yard lit up all night long. I suspect that it is disrupting their rest. If any one out there has an opinion on this please let me know your thoughts. I really would like them to get back to laying.