I came across this gem in the latest copy of the online version of the Economist magazine (which is one of my favorite reads!). Here is a link to the full article.
From the article: “It turns out that aliens are considerate. They seldom disturb earthlings during working or sleeping hours. Rather, they tend to arrive in the evening, especially on Fridays, when folks are sitting on the front porch nursing their fourth beer, the better to appreciate flashing lights in the heavens (see chart). The state aliens like best is Washington—a finding that pre-dates the legalisation of pot there.”