Entrepreneurs who vacation frequently return with happier, more positive outlooks on life. Studies show that people who take regular vacations have more fulfilling relationships with less friction and strife than those who don't, as well as fewer heart attacks and lower stress levels. This is especially true for people running small businesses (which tend to have high stress levels).
Moreover, they tend to be more creative and productive upon their return. The bottom line is that vacations are an essential part of your prescription for good health, balance, fulfillment, and a more productive work life.