Sometimes you have to let yourself have today.
The pressure you put on yourself to achieve is necessary.
You should not give yourself too much slack.
People allow themselves so much slack that they never do anything.
Personally, I'm not interested in living that way.
That being said - rest and downtime is part of the equation.
Sometimes the accomplishment of the day is clearing your mind, being present, and hanging out with your wife and kids.
It's all part of the bigger picture and as long as you know that you are pushing the facets of your life in the direction that you want to...then you must allow yourself to be calm on the days of rest.
Personally, I must get better at rest days.
Focus & Fortitude