A break isn’t something you win for having finished, it is a necessary tool to get things done. The site 99U has a lot to say about this and a lot of quotes from psychologists and business types.

If you start with the notion that having a quick sandwich at your lunch is productive in the sense that it takes less time, that’s true,” the author says. “But we don’t want a hard and fast rule—we want a functional rule.” The desk-lunch efficiency might not be worth it, he says, if you could gain more from stepping away.

Extreme Productivity author Robert Pozen quoted in 6 Ways to Quickly Restore Sanity to your Day – Sasha VanHoven, 99U (undated)

It even includes an acronym. I hate acronyms.

Stop what you are doing, move to a place where this state or emotion is not dominating you and THEN make a decision:

H: When you are hungry, your mind and metabolism do not work well.
A: When you are angry, your mind is reactive, clouded with irrational emotions.
L: When you are lonely, you are needy and vulnerable.
T: When you are tired, everything doesn’t work well – often coupled with hungry

All of these variables can interconnect to create a danger zone for capable decision making.

Read the full piece for this plus five more tips for remaining sane or regaining sanity in busy times.