Yes, some types of gnats—specifically biting midges (often called "no-see-ums" or sand flies)—do bite humans at night. While most gnats are harmless nuisances, female biting midges feed on blood and can inflict itchy, painful bites during dusk, nighttime, and early morning hours.
Gnat bites are often mistaken for mosquito bites, but their distinct features can help you identify them.
Biting Gnat Control
To permanently get rid of gnats, you must attack them at their source: eliminate the breeding grounds, break their reproductive cycle, and trap the remaining adults. The most effective methods target their specific habitats—houseplants and drains—using simple household solutions and targeted treatments.
Gnat bites typically last anywhere from 3 to 10 days. The swelling and itching usually peak in the first 24 to 48 hours and gradually subside, though scratching can prolong healing and increase your risk of a secondary skin infection.
Gnats are highly repelled by strong, pungent botanical scents. Their absolute least favorite smells include:
Gnats are most active during the warmer months, specifically from late spring through early fall (typically April through October). They thrive in temperatures above 70∘𝐹 combined with high humidity or recent rainfall.
To eliminate 100% of a gnat infestation, you must break their breeding cycle by treating the adults and eliminating their source. Use a DIY apple cider vinegar trap for adults and fix the source: let your plant soil dry out or treat it with a hydrogen peroxide mix.
Gnats lay their eggs in damp, moist environments containing organic matter. Depending on the species, the specific location varies:
In the Bible, gnats appear in both the Old and New Testaments as symbols of God's supreme power, human frailty, and religious hypocrisy.
No, gnats do not lay eggs in human hair. Common household gnats (like fungus gnats) are completely harmless to your scalp and exclusively lay their eggs in damp environments like moist potting soil, compost, or decaying organic matter.
Gnats bite because the females need protein and iron from mammalian blood to develop their eggs. They are attracted to you more than others if you emit higher levels of carbon dioxide, have higher body heat, or wear sweet-smelling lotions.
If you are waking up with itchy or painful spots but cannot see the culprit, it is likely either microscopic mites (like bird or rodent mites), tiny flying biting midges (no-see-ums), fast-jumping fleas, or a well-hidden infestation of bed bugs.
Most gnats do not transmit diseases to humans, though they can cause painful, itchy bites. However, depending on the species and geographical location, some gnats are vectors for specific illnesses or infections:
The most notorious culprits for intensely itchy bug bites include chiggers (microscopic mites), scabies, bed bugs, and fleas. Because individual reactions vary, identifying the bite pattern and taking quick action helps stop the scratching cycle.
If you're waking up with bites but finding no evidence of bed bugs, the culprits are often other indoor pests, mites, environmental irritants, or skin conditions.
To kill adult gnats instantly in the air or on surfaces, use a commercial flying insect spray, such as Zevo Flying Insect Killer. For a homemade option, spray them with a mixture of rubbing alcohol and water, or quickly vacuum them up.
Drains and Pipes
Bathroom drains are one of the most common gnat egg-laying spots in the entire home. That dark, slimy buildup inside your sink, shower, and bathtub drains is actually a mix of hair, soap residue, and stagnant water, and females lay their eggs right into it.
Gnats don't actually build "nests." Instead, they breed and lay hundreds of eggs in moist organic matter or stagnant water. To find their source, track down the specific type of gnat based on where they swarm.
These pests breed frequently, so it can be hard for homeowners to get rid of a gnat infestation.
Gnats are most active during the warmer months, specifically from late spring to early fall (peaking in May through September). They thrive in warm, humid weather and are especially prevalent following periods of heavy rain or drought, as standing water and wet soil create the ideal breeding grounds.
Yes, certain types of gnats—commonly known as drain flies or sewer gnats—live and breed in drains. They thrive in the dark, moist environments where organic slime, hair, and decomposing food particles build up inside pipes.
If you decide it's time to bring in houseplants in November or December, you might be unwittingly introducing gnats to the cozy confines of your indoor spaces. Other things, such as ripe or rotting fruits, compost bins, and moist soil are all things that bode well for gnat survival.
Flies don't hear human voices the way we do, but their antennae can detect the sound waves. Rather than using traditional ears, many flies use tiny, feathery hairs on their antennae to sense vibrations caused by airborne sounds. While they physically perceive the noise, they don't understand what you are saying.
States with the driest, coldest, or highest-elevation climates generally have the fewest bugs. Nevada, Colorado, and Wyoming are widely considered the best options. Their low humidity and lack of stagnant water prevent the swarms common in the rest of the country.