In my view, this applies not just to CEOs, but other people too. I've seen many around me and myself included, concentrate work so hard to achieve what we thought was best for ourselves and to keep our family happy. However, it would take a toll that our mislabeled 'needy' other halves would bear the brunt off. Switching off from work is absolutely necessary to keep a work life balance going and its necessary to keep in mind that there are other things that are just as important, like our spouses, family and our health, without which all the hard work is essentially meaningless. I personally tell myself at the end of the day that the work never ends, there is always something to do, and it can wait for tomorrow.