The response to a post like this is balance; however, the main problem is people do not know what is "balance". The easiest thing to do is to create time boundaries

Corporate culture (including some startups I know) value face time over outcomes (input vs. output valuation). If something goes wrong, managers tend to point to face time rather than the host of other factors, so people work even when there is no need. Face time = working hard. It is a vicious cycle and creates a huge inefficiency.

The solution is to create firm... let me repeat FIRM boundaries on things you value, whether family time or time at the gym. While this creates a constraint and seems bold, it improves efficiency because most of the time we spend in the office does not create value. It is pointless meetings, calls that go to long, and mindless Facebook scrolling. If your employees or your manager knows that you will leave at X time, it is remarkable to see how efficient your colleagues become.

Here is GOOD's post on sleep for entrepreneurs http://www.good.is/post/don-t-fall-asleep-at-the-wheel-succe...