Kinky.

why do they only seem to work in the summer... when you have your windows open at night???

they work all year round, but you just don't notice cos the windows are shut in the winter.

no... I think they have a "man" who goes round to check that there are enough windows open before they start

A construction project in our neighborhood has been waking me up at 6 a.m. all week, I thought the law in our town said no noise before 7.