Bat bugs feed on blood from bats, but when they migrate away from the bat roost area, they will feed on other warm-blooded animals, including people. This feeding is an annoyance but is not dangerous. According to medical authorities bat bugs are not known to transmit any diseases.
Controlling bat bugs requires the elimination of any bats that are present in the home or building. In addition to eliminating the bats you may need to control the bugs themselves.