Downtime

I got to my hair appointment about 15 minutes early today, and I'm just sitting here at my salon surfing the net on my iPhone while I'm waiting and thinking about how I don't really have any downtime anymore. Before my iPhone, if I got somewhere early I would just take a mental break, but now that I have the option to "get stuff done", I seem to never stop. What do you think might be the effect of never stopping? Am I heading toward a mental melt down, or my maximum potential? Sometimes these two things seem dangerously close together.