While French government bonds suffered with the market jitters surrounding Spain earlier this week, the premium above German bunds that France pays to borrow money is well below levels seen at the peak of financial stress last year, and French bonds have remained relatively steady.

WSJ: French Election Focuses On Economic Pledges

Almost eight out of 10 of those surveyed drank tea, coffee or cola either first thing or mid morning - periods of the day in which stress levels also peak for most workers.

BBC: Caffeine 'reduces productivity'