I noticed first when I arrived in the later afternoon. He got up without a problem. I let him and Loki out into the larger, greener pasture and he laid down again, did a little rolling/rubbing (happy roll, mind you) then resumed the same position and nibbled on some grass. Got up a bit later and wandered off.
He did the same thing later on, during feeding time. I went out to find him and he was laying again. He got up and walked over for his grain, ate, and I walked him around with my little brothers perched up on him for about ten minuets.
No signs of joint swelling. Eyes are clear with no nasal discharge. No coughing. No sneezing. No discharge from the eye. No colic symptoms. Gait is fine. Very responsive as usual. Interested in his grain and hay. Not lethargic or dazed looking. No signs of pain, no injuries.
He IS an old fart of a horse, think he's just lazy? I have observed him laying before, but never this much over the span of two hours. The better he gets the quiter and lazier he seems to become O-o