Bed bugs are hitchhikers and can be picked up virtually anywhere. Locker rooms, public transportation, hotel rooms, movie theaters, schools and just about any place people go. Bed bugs are carbon dioxide seekers. So if you are in a movie theater, for instance, your breath will fall down your clothing, the carbon dioxide accumulates, and attract any transiting bugs.
Similarly in your bed, they will nest where carbon dioxide is most prevalent from your breathing. It is the carbon dioxide the triggers the march of the bed bugs. So either quit breathing or call Budget Bugs.