For several years I used to get large carpenter ants in my bedroom crossing from one end of the room to the other. There were a few mornings then I woke up with one crawling over me. Some of them were pretty darned big too. Finally the problem came to a head when we had a new roof installed on the house. The roofers discovered that there was a hole in the old roof allowing water to leak into the attic and soak the wood in the walls and above the ceiling. Next came a builder who tore down the entire outside wall of the room and part of the ceiling. The wood was rotted and made a perfect place for carpenter ants to nest. Finally when he was cutting through a part of the ceiling that needed to be replace his saw cut through the ants nest and the critters came raining down all over the place. The whole time the ants nest was right over my head. Now I have a new wall, new wood, new ceiling, new window and, best of all, no more carpenter ants.