A Footman is stuck for a time standing on his bed ‘sleeping’. This state has persisted through several save/loads. The bed is also marked as ‘occupied’ and no other hearthlings will use it. The hearthling stays in this state until night arrives again (20+ hr of standing on the bed) and finally falls asleep.
I am not sure how to reproduce this, but I do have the save where this occurred. (8MB save, too big to attach directly)