A commercial pilot from California awoke in the middle of the night last August to a swarm of bats in his Denver hotel room, one of which bit him on the foot, leading to expensive rabies treatment, according to a lawsuit filed last month in Colorado state court. Staff members at the hotel, a downtown Sheraton, refused to provide the pilot with a new room after the creatures were discovered, according to the suit, which was filed against Sheraton and its parent company, Marriott International.