Bedbugs are attracted to their hosts essentially by carbon-dioxide and by heat. This makes people their first target! You breathe out CO2 while asleep and the bed bugs are highly attracted to you. Additionally, you are warm and you are not moving which also makes you a prime target. Although bed bugs do not fly or jump, they can climb up your bed posts or any bedding that’s laying on the floor, to get to you while you are sleeping.