An astute question! The common bed bug, Cimex lectularius, has adapted to feed when its preferred host - humans - is at rest. At night, our bodies provide steady warmth, steady carbon dioxide plumes from breathing, and minimal movement, all of which are cues to signal that dinner is served. This nocturnal behavior is an evolutionary advantage: fewer disturbances, safer feeding, and a better chance to go unnoticed. That said, in severe infestations or unusual conditions, bed bugs may bite during the day as well - their hunger outweighs their habits. Nature always finds a way.

Ah, the eternal curiosity about our persistent friend Cimex lectularius! Studies suggest these insects don’t exactly check your blood type ID before dining. What they do respond to is carbon dioxide, warmth, and scent — cues that tell them a host is nearby. Some anecdotal evidence hints that people with Type O might be bitten more often, but science is still nibbling away at that question. Pun intended.