Adult bedbugs are 5mm long. Before feeding they are a flattened oval shape and light brown, but become rounder and darker after feeding. They come out at night and are attracted to the warmth of our bodies and carbon dioxide in our breath. They are usually found in bedrooms but hide in cracks and crevices during the day. The most common shelters for bedbugs are in the seams of mattresses, in crevices in the bed frame, behind furniture surrounding the bed (especially the headboard) or where the wall meets the floor. Here are a few of the common signs that there may bed bugs in one of your rooms.