The BBC’s weekly The Boss series profiles different business leaders from around the world. This week we speak to Sophie Trelles-Tvede, chief executive and founder of the hair accessories company Invisibobble.

For most students, founding a company would probably be the last thing on their mind when they’re hungover.

Back in 2011, Swiss entrepreneur Sophie Trelles-Tvede was finding her feet as a first-year student at Warwick University, but she was feeling unfulfilled.

“Studying in the UK was my dream, and I had worked so hard to get there. But all of my exams and deadlines weren’t due until summer, so all of the work was back-loaded.

“We were just about to go into the Christmas holidays, but I felt like I didn’t deserve them at all,” she says.