Otherwise written as "what programming languages are being asked about late at night." To me, who rarely pulls up SO, correlating SO questions and page views with usage is a bit biased.
C++ devs tend to look at http://en.cppreference.com (using an English locale in this example).
To me, it tends to bias the sample towards the subset of developer population using SO, which would not be a representative sample size for a true population sampling in a statistical problem - it would be oversampled in one group to the exclusion of all other groups.