When in doubt, put it to the t-test.
You always did like white noise. When I lived in Sandwich the mosquitos used to find ways into my bedroom that I could never figure - cost me so many nights sleep!
I'm tolerably sure some mosquitoes can come through ordinary screens. Small ones seem to have no problem getting into a screened room at night, and I found one sticking through a screen mesh hole one morning. Most of those in the US are too big, fortunately.