It was the same with Schumacher: the need for the adrenaline rush, to push himself to the limit was always there. So without a Formula One car to race with he went on to do motorcycle racing and other stupid things, and obviously that wasn't enough to keep him happy, so he had a problem to sort out and returning to racing was his answer to the problem.
Niki LaudaI see myself as the mind of the business which takes care of every last detail; if you do not do this you cannot be fast enough.
Niki Lauda