My brother is a dentist. At four he leaves his office and goes home.<p>I have worked with software development for quite some time. The nasty thing is that lately it has become so easy to connect to work, fire up the dev-environment from home on evenings and weekends to continue tinker with that piece of code or that nasty bug.<p>Imagine having a job where your problem is not constrained to a person that has to be in your vicinity for you to work or a job where you cannot at least fake that you have problems with your internet connection :)<p>You cannot easily unscrew your head at the end of the day and it is only too natural to continue to linger in your head in problem-solving mode. Imagine doing this for the greater part of your life and you may end up with exactly the problems described here.