Bed bugs are accomplished hitchhikers, and are usually first carried into a home, apartment, or hotel room by people, hiding in luggage, furniture, or other belongings. Signs of infestations include bloodstain fecal smears on bedding walls, curtains and other light colored surfaces.
At first, bed bugs hide in the cracks, seams and folds of mattresses, bedding, upholstery, and the bed frame or furniture itself. Picture frames, peeling wallpaper, and any area forming a crack can serve as a harborage, including at ceiling level. As the population increases, they move out into the rest of the room, harboring behind door frames, window frames, molding, under the edges of carpets and rugs, and inside walls. With larger numbers of insects or if poor control efforts have been used, bed bugs may become scattered within rooms and may move to adjacent hotel rooms, apartments, etc.