What draws bed bugs out of hiding?

What draws bed bugs out of hiding is primarily host cues that signal a blood meal is available, as bed bugs are nocturnal and hide during day in mattress seams, box spring cracks, headboard crevices, behind baseboards, and furniture joints within 5 to 8 feet of bed, coming out at night to feed. The strongest attractants are carbon dioxide exhaled by humans during breathing, body heat and warmth from sleeping person, and certain chemicals in human sweat and skin such as lactic acid. These cues are strongest between 2 AM and 5 AM when hosts are in deep sleep. To draw them out for detection, you can use your own presence as bait by sleeping in bed with interceptor traps under bed legs that catch bugs as they climb, making bed an island by pulling away from walls and ensuring bedding does not touch floor, so bugs must cross interceptors. Commercial CO2 traps using dry ice that release carbon dioxide mimicking human breathing can draw them out. Gentle heat from hair dryer on low applied to suspected hiding spots can cause movement. However, bed bugs will not come out if recently fed or if disturbed by light. They are not drawn out by food, sweet smells, or sperm. The most effective way to draw out and confirm infestation is to sleep in bed with encasements and interceptors, then inspect with flashlight at night, and professional heat treatment draws them out and kills all stages.