Tips for sleeping with the window open on summer nights

Short answer

On hot summer nights, sleeping with the window open gives a more natural coolness than air conditioning. The obstacles are mosquitoes, dust and pollen.

For a comfortable night

1. Fit a filter to the window. Stops mosquitoes and tiny insects such as sand flies, and reduces dust and pollen.
2. Switch off the light. With the window open, light indoors attracts insects.
3. Cross-draught. Leaving the door ajar adds to the coolness.
4. Keep the bed out of the draught.