I have a field ornament who regularly plays dead so we get people knocking on the door to tell us (a main road runs next to my fields). I have also someone report me to animal welfare for having a dead sheep in the field is was actually the inside of a T/O rug my naughty horse had pulled off the gate into a heap................. I did actually have a very leary ewe who recently lambed and I had to stop the guy from disturbing her and her lamb.
i find it a worry when they lay like that, as mine got older she slept more deeply and one day i got right up to her and she didnt realise, i could see she was breathing but was concerned that she didnt sit up so i called her a little bit louder and she leapt up and galloped to the other side of the field , i think she was a bit peeved that i woke her....