Yep, thats what happens to mine when they lay down. Especially if they lay in hay. As for the water, everyone else has given great advice so I don't really have anything to add (I'm late to come to this as well) but it reminds me of a little story lol.
A few years ago we got my pet steer a new water tub. One of those huge black plastic ones that are supposed to be nearly indestructible...Well, we put it in in the middle of winter when it was in the -'s (F) and he was alone at the time so when it was that cold we'd shut the door. Well, he kept breaking out and after 2 or 3 days we realized he was so afraid of the water tub he was breaking out to eat snow! Poor guy. We quickly switched back to the little tote things we usually use for him and gave that one to the horses. How silly is he..!
TM Tardy's Chick "Hunter" - 13 yo Paint
Remmy - 18 yo Morgan/QH cross
Gunner 3/31/11, Heidi 7/2009 Miniature Sicilian donkey