Read Ecclesiastes 2:23 Using Other Translations
For all his days are sorrows, and his travail grief; yea, his heart taketh not rest in the night. This is also vanity.
For all his days are full of sorrow, and his work is a vexation. Even in the night his heart does not rest. This also is vanity.
Their days of labor are filled with pain and grief; even at night their minds cannot rest. It is all meaningless.