Up to 4 million people do shift work in the UK. Emergency services ... and go above and beyond for their organisation. Happy workers are more productive workers.

But maybe we should: Studies suggest that happy people are actually more productive and successful, and less likely to leave their jobs. This quiz measures how happy you are when you’re on the clock.

On the survey, India topped the list, with 92.6 percent saying they are happy at work ... and regions surveyed, people who feel themselves growing at work reported being happier.