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—
KJV
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:)
ASV
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),