Being more productive can reduce stress and cause a reduction in your stress level. The more you get done, the less you think about when you are NOT on the clock.
There are several ways you can be more productive. Fast Company (one of my favorite entrepreneur blogs) has some great tips, 11 to be exact. http://www.fastcompany.com/3024252/11-expert-tips-to-help-you-be-more-productive-in-2014
The Harvard Business Review has some great stress reducing tips: