Ecclesiastes 8:16
I applied my mind to know wisdom and to understand the business that is done on earth--how neither day nor night one's eyes see sleep.
Psalm 127:2
[It is] in vain for you who rise early [and] sit late, eating the bread of anxious toil, [when] thus he provides for his beloved in [his] sleep.
Ecclesiastes 1:13
I applied my mind to seek and to search by wisdom all that is done under the heavens. It [is] a grievous task God has given to {humans}.
Ecclesiastes 2:23
All his days [are] painful, his labor [brings] grief, and his heart cannot rest at night. This also [is] vanity!
Genesis 31:40
[There] I was, during the day the heat consumed me, and the cold by night, and my sleep fled from my eyes.
Ecclesiastes 4:8
Sometimes a man is all alone with no companion; he also has neither son nor brother. Yet there is no end to all his toil, and his eye is not satisfied with wealth. [He laments,] "For whom am I toiling and depriving {myself} of pleasure?" This also [is] vanity--it is an unhappy business!
Ecclesiastes 5:12
The sleep of the laborer [is] pleasant, whether he eats little or much, but the wealth of the rich man does not allow him to rest.
Ecclesiastes 7:25
I set my mind to try to seek wisdom and the plan, and to know that wickedness [is] foolishness and that folly [is] delusion.
Ecclesiastes 8:7
Surely no one knows what will be, so who can tell anyone what will happen?
Ecclesiastes 8:9
I saw all this as I applied my heart to all the deeds done under the sun: {sometimes those in authority harm others}.