NET
16 When I tried to gain wisdom and to observe the activity on earth—even though it prevents anyone from sleeping day or night—
Darby
16 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),
KJV
16 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:)