Why a bedbug scientist volunteers as the host
In a garden laboratory in Gloucestershire, bedbugs are not merely being studied from a distance. They are being fed on purpose, in large numbers, on the arm of the man who breeds them.
Entomologist Dr Richard Naylor has spent the past five years sleeping with bedbugs so he can test whether sprays, repellents and other control devices actually work in real-world conditions. On feeding days, which come around twice a week, he straps pots containing thousands of insects to his arm and lets them feed while he continues his work. When he needs to evaluate a device overnight, he sleeps in the test room as the host the insects require.
The arrangement is unusual, but it reflects a basic truth about bedbug biology. These insects do not remain active in the absence of a human or animal host. They wait, then emerge when they detect warmth, carbon dioxide and the presence of blood nearby. A laboratory trial without a live body in the room would tell only part of the story.
Naylor says he has been bitten millions of times and no longer reacts to them in the way most people would. His skin reddens briefly after feeding, then settles within about half an hour. For him, the bites are a work requirement rather than a clinical event. For the people he advises, the stakes are very different.
Resistance is making infestations harder to control
Bedbugs have developed resistance to modern insecticide sprays, and that resistance has turned routine control into a stubborn technical problem. A product that looks effective in a controlled demonstration may fail in a bedroom once the insects are hidden inside seams, cracks and nearby furniture.
Naylor’s work focuses on those practical failures. He breeds thousands of bedbugs in a self-contained two-bedroom suite in his garden and distributes them to customers around the world, including canine detection teams used by hotels to identify infestations before they spread. He also helps businesses test products before they are sold. The scale is striking: he says he feeds around 20,000 bedbugs on his arm every three to four days.
Resistance changes the biology of control. When insects survive contact with insecticides, the infestation can persist long enough to seed new rooms, new homes and new anxieties. In that setting, the challenge is not just killing visible bugs. It is finding the ones that remain hidden, dormant and protected by structure rather than chance.
Bedbugs usually conceal themselves in dark crevices close to the bed rather than inside the bedding itself. Common hiding places include mattress piping, zips, the rear of the bed frame and other narrow gaps near a sleeping person. Naylor points to one of the clearest signs of infestation: inky black spots left behind by the insects, often in the shape of an x.
The physical bite is only part of the injury
Most bedbug bites are uncomfortable rather than dangerous. Ade Williams, lead pharmacist at Bedminster Pharmacy in Bristol, described them as clustered bites or lines of bites, a pattern that often helps distinguish them from other insect exposures. Itching is the dominant symptom, and scratching raises the risk of secondary infection.
For symptom relief, Williams advised antihistamine tablets and emollient creams, while the NHS recommends a cool compress, such as a clean damp cloth, to reduce itching and swelling. Keeping the affected area clean also lowers the chance that irritated skin will become infected.
A severe allergic reaction to bedbugs is possible, though rare. The greater burden is often less visible. Naylor says bedbugs can leave people with lasting PTSD-type symptoms, a claim that matches the experience of many households that describe sleep disruption, hypervigilance and a lingering fear of re-infestation after the insects are removed.
That psychological effect is central to why bedbugs cause such distress. The insects feed at night, when people are trying to sleep, and they can turn a bedroom into a place of repeated anticipation rather than rest. The bite is brief. The memory can last much longer.
What households are told to do first
The Bed Bug Foundation advises anyone who suspects an infestation to act quickly and methodically. Decluttering around the bed helps expose insects that may try to scatter. Bedding and other soft furnishings should be removed and placed in bin bags for washing. The mattress and bed frame need close inspection, especially near the head of the bed. Silica dust and thorough vacuuming are part of the control approach, and bed isolation devices can help stop the insects returning to the sleeping area.
These steps work best when they are paired with professional identification. Bedbugs are skilled at hiding, and a missed cluster can restart the problem after a household thinks it has resolved the infestation. That is why Naylor advises people who suspect bedbugs to contact a professional rather than relying on guesswork alone.
A single missed crevice can keep an infestation alive.
The broader public-health message is less about drama than precision. Bedbugs are not usually dangerous in the way some other pests are, but they are difficult to eradicate, increasingly resistant to sprays and capable of causing prolonged distress in homes, hotels and transport systems. Naylor’s laboratory work sits at the point where entomology, product testing and bedside reality meet: if a repellent cannot protect someone while they are actually sleeping, the laboratory result has little value in the room where the problem begins.
Why this work depends on a human host
The decision to sleep with bedbugs is not an eccentric flourish. It is the only way to reproduce the conditions that determine whether a device or spray can interrupt feeding in a real bedroom. Without a live host, the insects remain inactive. With a host present, they feed, move, hide and reveal whether control measures are doing anything at all.
That makes Naylor’s role both scientific and personal. He is not simply maintaining a colony; he is recreating the nightly encounter that defines the infestation. In doing so, he is testing whether products marketed as solutions can survive contact with the biology of the insect itself.
For households dealing with an outbreak, the lesson is more grounded than reassuring: bedbugs thrive in the spaces people use for rest, and getting rid of them often requires persistence, inspection and expert help rather than a single spray from a shelf.