Use indoors in sleeping areas to detect bed bugs. Use indoors in sleeping areas to detect bed bugs. To detect bed bugs early, you must place traps before an infestation occurs; otherwise you are just confirming an existing infestation. Use indoors in sleeping areas to detect bed bugs. To detect bed bugs early, you must place traps before an infestation occurs; otherwise you are just confirming an existing infestation. To maximize effectiveness, place all detectors at same time.