How should leaders take care of themselves?

This is a difficult thing to do in today's extremely competitive environment. There will always be somebody who is ready to step into your shoes at the slightest sign of weakness.
At the end of the day, is anyone going to pay you more because you work 24/7? Probably not! If you run yourself into the ground you are of no use to your staff / company and of little use to yourself. When you are SO tired, doesn't your judgement become slightly affected?
It is easy to lose sight of the damage you can do to yourself and your role by continually working flat out. And let's not forget about the damage it can do to your health. If you are over-tired, do you become somewhat cranky? Do you start snapping at your staff? Will this make you rather unapproachable? Does team morale suffer as a result?
Trying to strike the right work / life balance is difficult but vital. When you are well rested, you can think more clearly and perhaps even approach things from a different perspective which you might well overlook when you are exhausted.
Protecting yourself and your reputation is also important. Try to ensure that you do not leave yourself vulnerable to criticism both in a professional and personal capacity as this too can undermine your authority within your organisation.