If you’re in the area of Italy on the A4 between Turin and Novara (other Italian mossie hell-holes are available!) you’re going to be eaten alive if you dare to leave a window even slightly open whilst you sleep at certain times of the year. Some parts of Belgium and the Netherlands were also riddled with the mossie pest.
Back in the day (1980s) we used to use a 12V plug-in device called a UFO, which looked like a flying saucer, onto which you’d put a pastrille. Pastrilles were pale blue oblong tablets just like very thick dry pieces of blotting paper.
You’d then be able to have the windows open a bit once you saw some wispy smoke from your UFO. I also used a fan on low speed for cooling myself, but it had the added advantage of wafting the smoke out of the windows and keeping the hoards of little biters at bay.
A tube of Anthisan was also a good investment.
Happy days once you got the job sussed!! 