The problem is that stress conforms to many "laws" that physical objects do. In other words, the stress doesn't disappear just because you're not in it at the moment. Rather, the majority of it gets transferred to your coworkers and friends. In fact, it actually creates more stress from the inconvenience it creates on those friends and coworkers.
Translation: Sparks! Dammit! Answer your phone! You're not going to Denver on Monday!