Most bed bugs find harborage within 5 feet of their host’s resting spot. For us, this is our beds, couches, and chairs. From within 5 feet, it can detect the location of its next meal. They do this by detecting signals given off by our bodies. This includes such things as: Body heat, odor, vibrations, carbon dioxide, and perspiration.
You can find them further away in secondary locations. The ability to locate their host changes from further distances. As a result, they need to climb things to pick up signals. You will find males driven into secondary areas of infestation. Bug bombs and improper treatments will also send them packing out of primary areas. Otherwise, bed bugs move into further reaches of the room once the population is high enough. Under rugs is less common. Think more curtains, behind picture frames, and at the ceiling-wall junction.