Sleeping with the window open: how to do it without mosquitoes, dust and pollen

Why do we want to sleep with the window open?

In a closed bedroom, temperature and humidity rise through the night and the air gets heavy. Many people say they sleep better in cool, fresh air. But an open window brings three problems:

1. Mosquitoes and small flies
2. Dust, and soot that comes with the cool morning air
3. Pollen, especially in spring and early summer

Mosquitoes first

A standard insect screen stops mosquitoes. But smaller blood-sucking flies such as sand flies can pass through ordinary mesh. If you get bitten at night but cannot see a mosquito, these may be to blame. The fine-pored structure of a window filter stops these tiny insects too. About tiny insects

Then dust and pollen

Dust coming through a window left open all night settles on the bed, bedside tables and curtains. In pollen season, this can mean waking up with a runny nose. A window filter holds most of these particles back at the window.