This piece refers to the watches of the night,Like most I've spent periods of my life when I've been working when the world sleeps and it is a strange and very different place to occupy.The wiki bit ....The watches of the night, or night watches, refers to the ancient practice of dividing the night into periods for the goal of keeping watch. Lasting from sunset to sunrise, guards relieved each other at each of these periods. The Hebrew and Babylonian watches of the night were divided into three military watches; the first (evening), middle (midnight) and morning watch.[2] As Christianity began, the number of watches increased to four watches due to the influence of the ancient Greeks and Roman Empire, who used four watches throughout the night. 

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