The answer to 'bed bug scratching sounds' is that bed bugs do not actually make scratching sounds. The sounds you may be hearing are likely caused by the bed bugs themselves moving around and crawling on surfaces, or by you feeling them moving on your skin. Bed bugs feed on human blood, and their bites can cause itchy, irritated skin that may lead to scratching.
If you suspect you have a bed bug infestation, it's important to look for other signs such as small blood spots on your sheets, seeing the bugs themselves, or finding their droppings. Catching an infestation early is key, as bed bugs can be difficult to eliminate once they've become established. In many cases, it's best to call in a professional pest control expert to properly identify the problem and implement an effective treatment plan.