Bedbugs are attracted to the carbon dioxide that you exhale. Bedbugs come out for feeding when they detect the presence of carbon dioxide, which humans produce upon exhaling. Since they prefer darkness, this one sensory asset is their guide to where you are. It dictates where they will live, which is usually going to be no more than 10 or 20 feet from where you sleep. It also guides their movement if they have to find other food sources.