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, or by your own reactions to their presence.
Bed bugs are small insects that feed on human blood. When they bite, it can cause itchy, red welts on the skin that may lead to scratching. The scratching sounds you hear are likely your own nails against your skin as you try to relieve the itchiness. Additionally, bed bugs may make small noises as they move around or feed, which can be mistaken for scratching sounds. If you suspect you have a bed bug infestation, it's important to address it promptly to prevent the problem from worsening.