Bedbugs are tiny, oval, brownish insects that feed on animal or human blood. Adult [bedbugs] have flat bodies about the size of an apple seed. While bedbugs cannot fly, they can easily travel through floors, walls, and ceilings. Over the course of a lifetime, female bedbugs will lay hundreds of eggs, each about the size of a speck of dust.
You could have bedbugs if you wake up with itchy places you didn't have when you went to sleep, particularly if you bought a used bed or other used furniture around the time the bites began. Other symptoms of bedbug infestation include: