Bed Bugs and Beyond Once considered a rare nuisance, bed bugs are making a huge comeback throughout North America and Europe. During the day, they lurk in crevices, waiting for their human hosts to go to bed. While the host is asleep, the bugs crawl out of hiding to feed on blood. And bed bugs are not alone: lice, chiggers, ticks, mites, and scabies can also infest our bodies and homes. Sleep tight!