Most depressing month of the year? 'tis passing strange.

[Combwork]

Over here it's January, with last Wednesday (or maybe the Wednesday before) that's slated as the most depressing day. I suppose it makes sense, the let-down after Christmas and New Year coupled with the fact that in the UK, tax returns have to be in by the end of January. Is it the same in the wide wide world? And why is the full moon linked with insanity?