Are You Pushing Yourself Too Hard?

Yes, darnit, I know I posted already today, but I read this article at The Huffington Post, and I had to share it with everyone.  I see this every day in my job.  I see this all around me, even in our personal lives.  Do we drive ourselves to burnout?  Is our push for efficiency actually resulting in loss of productivity?  I think yes.  In my opinion, we should all take a little more time to enjoy the one life we get to live, and then maybe the time we spend working will result in higher quality of work. 

I almost never get enough sleep.  Rarely more than five or six hours.  My coworkers and I all work 70-90 hours per week, and I'm not talking sitting at a desk work (though that can be just as tiring and often more mentally stressful).  This doesn't count any work we have on the side.  How can anyone expect productivity in this situation?

I'm interested to hear everyone else's take on this.  Are you overworked, overstressed and underslept?  What do you do to rest and reenergize before heading back to the grindstone?