The name “bed bug” derives from the preferred habitat of this particular insect: warm houses and inside beds and bedding. Bed bugs have flat, small, oval bodies and are mainly active at night, but are not exclusively nocturnal. They usually feed on their hosts without being noticed, but leave behind traces of blood stained evidence on bedding linens. Bed bug bites can cause allergic reactions, rashes and skin infections if scratched open. Common in SWFL: Red Coats, Chinches and Mahogany Flat Bed Bugs.