How can artificial night light both hurt some mosquitoes over winter and raise near-term risk for people?

Answer: It keeps females active later

It keeps females active later ✓ — Artificial light can delay the seasonal switch that would normally help some mosquitoes prepare for winter. That delay may keep females active and biting later into the season, even though it can also leave them with poorer fat stores for surviving winter.

It makes each bite more poisonous — Light does not make a mosquito bite chemically more poisonous. The public-health concern is timing: if females stay active later before entering dormancy, people may face a longer window of bites rather than stronger bites.

It sterilizes mosquito predators — Predators can be affected by light pollution, but sterilizing predators is not the mechanism in this mosquito story. The reported effect is inside the mosquito life cycle, where artificial light can postpone dormancy preparation.