As VIPs come to Charlotte, N.C., for the Democratic National Convention, some are being greeted by undesirable guests in their hotels. No, not protesters. Bed bugs. Reports of the little blood-suckers have been on the uptick in Charlotte, and they are a growing problem in the lodging industry throughout the country. The good news: Delegates, and anyone who travels, can take precautions against bed bugs—small insects that feed on human blood and are usually active at night when people are sleeping.