I am learning the importance of rest. I am finding that performance and effectiveness suffer when I allow myself to get run down. I know this seems like a no brainer, but I really used to underestimate this. I notice huge differences in my attitude, ability to focus, and quality of performance when I am well rested. This gets so lost in my list of what must get done.
A Pastor's Thoughts 
I was just challenged the other day with a similar thought. Yes, you may be excelling, but at what cost? We put so much pressure on ourselves that we forget to stop and live.