Workers in the East Midlands are missing out on up to £31bn of overtime each year, according to the TUC trade union body.
Figures from the union show 20% of employees in the East Midlands work an extra seven-and-a-half hours of unpaid overtime a week.
Working extra hours means that you get tired. When an employer looks at somebody who's working 45 hours a week who's only contracted for 40, that's great for them. But, in the long-run, they could actually end up with an empty chair simply because that person is burnt out.