No, my stalls aren't exactly usable at the moment. They're always full of hay.
Plus, my horses are kept in a dry lot, which has a HUGE lean-to for them to sleep under. That and they always seem to sleep in the open anyways.
I do have Honey and Connor in the barn, so Honey can gain weight. They know where to go and when. They have the routine down; they walk in and go straight to the feed trough.
I only have the horses in the barn if its storming and we have young foals, for foaling, or in the winter time for my smaller horses so they can get more food.
So, no to answer your question.