Bed bugs are very hardy insects. Both adults and, nymphs can survive prolonged periods without food or under adverse temperatures conditions. Humans are the preferred host for the common bed bug, normally bed bugs will eat at night, but they will feed during daylight house in places such as theaters, offices, and rest rooms. After feeding, the bug’s body enlarges considerably, becoming longer and much less flattened. Bed bugs have piercing-sucking mouthparts that enable them to pierce the skin and suck blood from their host. Bed bugs bites cause welts and irritation to some people, but other people may not react at all.