'Night watches' in the Bible

When I remember thee upon my bed, I meditate on thee in the night-watches:

Mine eyes anticipate the night-watches, that I may meditate in thy word.

"Arise, cry out in the night, at the beginning of the night watches; pour out your heart like water, before the face of the Lord. Lift to him your hands, for the life of your children, who faint in starvation, at the head of all streets."

And there were shepherds in the same region, lodging in the field, and keeping the night-watches over their flock,