Bed bugs are extremely hardy insects and can live in extreme conditions. Adults can live up to a year without feeding in buildings that don’t even have heat. This is also a reason why they can spread so efficiently to other areas, waiting for someone to give them a ride from place to place. Humans are the preferred hosts but bed bugs will feed on cats, dogs, birds, and rodents if desperate. They mostly feed at night when people are asleep but can feed during the day if conditions permit. Places like hospitals, theaters, and hotels may allow for daytime feedings.