All of my horses lay down in the mourning at about 11:00 including my neighbors so when I look outside and see a ton of sleepy heads. My horses and the neighbors tend to sleep all together on either side of the fence. Later on throughout the day the babies sleep. Usually the older mares just stand around watching the babies or sometimes they'll take a nap with them.
before I sold my stallion i'd wake up every mourning at about 6:00 and find him asleep in some uneaten hay.