Bed bugs are found around the world and their presence has nothing to do with how clean the environment is. Because these insects are found where people sleep, you could have picked up an unwanted "passenger" from a hotel stay, a flight, or a visit to the home of someone who may not even be aware that they have bed bugs. Because they're so small, bed bugs often go undetected as they hide in mattress seams, cracks and crevices, bed frames, under wallpaper, and so on.