Experts say hard work can lead to happiness.

Researchers from Gothenburg University in Sweden say working to achieve a goal, rather than attaining it, makes people more satisfied.

They say winning the lottery or achieving a goal at work gave a temporary high, but it did not last.

Instead, they found that working hard to reach a target was more fulfilling.

Lead researcher Dr Bengt Bruelde, from the university's philosophy department, says: "From our research the people who were most active got the most joy. It may sound tempting to relax on a beach, but if you do it for too long it stops being satisfying."