'Night' in the Bible

For all his days are sorrows, and his travail grief; yea, his heart taketh not rest in the night. This is also vanity.

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:)

The fool is so worn out by a hard day's work {he cannot even find his way home at night}.