Cockroaches feed mainly at night.

The German Cockroach is the most troublesome cockroach in the U.S.
Early fossil remains show that cockroaches that lived over 300 million years ago would have looked very similar to present-day species.
Many humans are allergic to the dust created by cast-off cockroach skins, dead bodies, and droppings. Studies have shown that Asthma in children was worse in areas that had a heavy infestation of cockroaches. Cockroaches can literally make you sick by contaminating food and transmitting diseases such as gastroenteritis, food poisoning, and diarrhea. Cockroaches prefer pressure on three sides of their body, which keeps them in cracks and crevices where they spend 75% of their lives. Some products not normally considered food -- such as starch-based paints, wallpaper paste, envelope glue, and bar soaps -- contain carbohydrates, and hence are food for cockroaches. Cockroaches do not bite.  The spines on their legs may cause a minor irritation if handled.  Contrary to popular belief, except in the most filthy conditions, cockroaches do not transmit human diseases.  In fact, there is evidence that they secrete bactericidal substances from their tarsal pads which prevent the etransmission of pathogens.