Work four days a week, but get paid for five?

It sounds too good to be true, but companies around the world that have cut their work week have found that it leads to higher productivity, more motivated staff and less burnout.

"It is much healthier and we do a better job if we're not working crazy hours," said Jan Schulz-Hofen, founder of Berlin-based project management software company Planio, who introduced a four-day week to the company's 10-member staff earlier this year.