These little buggers are the stuff of nightmares. They feed on human host when they sleep but in large numbers, are even around in daylight times. All nymphal stages need warm blooded meal in order the molt into the next stage and grow. After the fifth stage it is an adult. As an adult, it can take many bloodmeals through several weeks. Bed bugs are even known to survive over a year without feeding, entering a dormant stage until a host is detected.