Waking up with a row of itchy red spots you did not have when you went to bed is unsettling. The good news is that very few insects feed at night, so the marks they leave are often enough to name the culprit. Once you know what is biting you, getting rid of it becomes far more straightforward.
The usual night-time biters in UK homes are bed bugs, mosquitoes, fleas, gnats and midges. Each leaves a slightly different mark and a different pattern, so start with the bite itself. And if the signs point to bed bugs or fleas, there is one treatment that ends it in a single visit: whole-room heat treatment, which kills every insect, egg and larva at once.
Key takeaways
- Bites in a neat line or row, plus dark specks on the mattress seam, almost always mean bed bugs.
- Low clusters around the ankles point to fleas; lone raised bumps in summer point to mosquitoes.
- Shop-bought sprays rarely clear bed bugs because eggs and hidden insects survive and rebuild the infestation.
- Heat treatment clears bed bugs and fleas in one visit by heating the whole room past the point any life stage can survive.
- You do not need to throw away your mattress or furniture with heat treatment.
How to read the bite
Bed bugs
Bed bug bites are small, red and fiercely itchy, and the giveaway is the pattern: they often appear in a neat line or a short row, because the bug feeds, moves a little, and feeds again. Look at your sheets as well as your skin. Small smears of blood on the pillowcase, or tiny dark spots like flecks of ink along the mattress seam, point straight to bed bugs. The dark spots are droppings, left after the bug has fed on you overnight.
Mosquitoes
A mosquito bite is also red and itchy, but it tends to stand alone as a single raised bump with a ring of inflamed skin around it, rather than forming a line. Mosquitoes are far more active in warm weather, so a fresh crop of bumps in summer, especially if you have had a window open, usually points their way.
Fleas
Fleas bite low and in clusters. You will typically find groups of three or four small bumps together, often around the ankles and lower legs, and sometimes around the waist. The bites are smaller than the other night-time pests leave, and fleas stay active all year round, so the season is no help in ruling them in or out. A pet in the house makes them more likely still.
Gnats
Gnat bites are red and irritating, and where flea bites cluster and bed bug bites line up, gnats bite at random, scattered across whatever skin was exposed. They can also bring on an allergic reaction in some people, occasionally raising a small fluid-filled blister, so they are worth not scratching.
Midges
A midge bite is more painful than it is itchy, and you tend to know about it. Like gnats, midges are outdoor insects and rarely set up home indoors, but an evening in a beer garden, at a barbecue or in the garden at dusk can leave you with bites you only notice the next morning.
Bed bugs or something else? A quick check
If the bites run in a line and you can find blood smears or dark specks on the bedding, treat it as bed bugs until proven otherwise. Lift the mattress and check the seams, the bed frame joints and behind the headboard for live insects, shed skins or those dark droppings. Scattered single bumps with no signs on the bedding lean towards mosquitoes or gnats, and low clusters around the ankles lean towards fleas. Knowing which one you are dealing with decides what happens next, because the treatments are not the same.
What to do about it
Mosquitoes, gnats and midges are mostly a matter of keeping them out: fly screens on bedroom windows, removing standing water nearby, and not leaving lights blazing next to open windows at dusk. Fleas usually trace back to a pet, so treating the animal and washing bedding hot is the first move. If fleas have established themselves in carpets and furniture, they need the same answer as bed bugs below.
Bed bugs are the one to take seriously. They are notoriously hard to clear with shop-bought sprays, they hide deep in seams, skirting and furniture, and a few survivors will rebuild the infestation within weeks. They also travel, spreading from room to room and into neighbouring properties. Sprays have another weakness: they rarely touch the eggs, so a fresh generation hatches after every DIY attempt.
Why heat treatment is the answer if something is biting you in bed
For anyone being bitten in their sleep, heat treatment is the closest thing pest control has to a reset button. We heat the affected rooms to a temperature no insect can survive and hold it there, so bed bugs, fleas and their eggs and larvae are all killed in the same visit, including the ones hidden deep inside mattress seams, bed frames, skirting boards and furniture that sprays never reach.
That is why it works where repeated spraying fails:
- Every life stage dies at once. Heat does not care whether the insect is an adult, a nymph or an unhatched egg, so there is no surviving generation to start the infestation again.
- It reaches where insects hide. The hot air penetrates seams, cracks, voids and furniture rather than only treating surfaces.
- Nothing needs throwing away. Mattresses, beds and sofas are treated in place, not replaced.
- One visit, no chemical residue in your bedroom. Most homes are back to normal the same day.
For bed bugs specifically, our bed bug heat treatment service covers the inspection, the treatment itself and aftercare advice, with guaranteed results. If you are still unsure what is biting you, our technicians will identify the insect before any treatment is agreed, so the treatment is always the right one.
Being bitten in your sleep? We can end it in one visit with whole-room heat treatment.
We are open every day except Christmas Day, early until late. Send us a message for a fast callback, or call the number at the top of this page.
When to call us
If you have woken with bites and found any of the bed bug signs above, or you simply cannot work out what is feeding on you, talk to our team. We will help you identify the pest and explain how we would deal with it. Our technicians are RSPH (BPCA) Level 2 qualified, we have been clearing pests since 2010, and we are open every day except Christmas Day, from early until late, so a bad night does not have to become a bad week. You deserve a pest-free home and a proper night’s sleep.
Frequently asked questions
In UK homes it is usually bed bugs, fleas, mosquitoes or gnats. Bites in a line with dark specks on the mattress seam mean bed bugs; clusters around the ankles mean fleas; lone raised bumps in summer usually mean mosquitoes or gnats that came in through a window.
Yes. Whole-room heat treatment raises the temperature beyond what bed bugs can survive and holds it there, killing adults, nymphs and eggs in the same visit, including insects hidden deep in seams, frames and skirting that sprays cannot reach. Results are guaranteed.
No. Heat treatment treats mattresses, bed frames and furniture in place, so nothing needs to be thrown away or replaced. Throwing a mattress out can actually spread bed bugs through the house as it is carried through other rooms.
Shop-bought sprays only kill the insects they directly touch. Bed bugs hide deep in seams, joints and skirting, and sprays rarely affect their eggs, so a new generation hatches within weeks and the bites start again. Heat reaches all of them at once.
Yes. The same whole-room heat that clears bed bugs also kills fleas, their larvae and their eggs in carpets, pet bedding and furniture. It is the fastest way to clear an established flea infestation from a home in a single visit.