Requiring shepherds to watch their flocks without appropriate and flexible seating arrangements is a contravention of health and safety regulations and human rights. The provision of benches, stools and orthopaedic chairs is recommended. The angel of the Lord is also reminded that before shining his or her glory around it must be ascertained that all shepherds are issued with suitable eyewear conforming to British Standards for filtering the harmful effects of UVA, UVB and glory.
more like that here. You'll need to scroll down a bit.