Berean Study Bible
When I applied my mind to know wisdom and to observe the task that one performs on the earth—though his eyes do not see sleep in the day or even in the night—

King James Bible
When I applied mine heart to know wisdom, and to see the business that is done upon the earth: (for also there is that neither day nor night seeth sleep with his eyes:)

American Standard Version
When I applied my heart to know wisdom, and to see the business that is done upon the earth (for also there is that neither day nor night seeth sleep with his eyes),

Darby Bible Translation
When I applied my heart to know wisdom, and to see the business that is done upon the earth (for also there is that neither day nor night seeth sleep with his eyes),

Douay-Rheims Bible
And I applied my heart to know wisdom, and to understand the distraction that is upon earth: for there are some that day and night take no sleep with their eyes.

English Revised Version
When I applied mine heart to know wisdom, and to see the business that is done upon the earth: (for also there is that neither day nor night seeth sleep with his eyes:)

Young's Literal Translation
When I gave my heart to know wisdom and to see the business that hath been done on the earth, (for there is also a spectator in whose eyes sleep is not by day and by night),