Our Rabbis have taught: "The night has four watches," so says Rabbi. R. Nathan says "Three." What is R. Nathan's reason? It is written (Judges 6:19) "And Gidon, and the hundred men that were with him, came the edge of the camp in the beginning of the middle watch. And we are taught that Tichon (middle) cannot be used unless something precedes and something follows it. But Rabbi disputes this and says that "by the middle is meant one of the two middles." R. Nathan says: "Is it then written one of the middles? Behold! It is written the middle!" What is Rabbi's reason? R. Zerika in the name of R. Ami, who speaks in the name of R. Joshua ben Levi, said: "One passage says (Ps. 119:62) 'At midnight do I constantly rise to give thanks unto Thee,' etc., and another passage says (Ps. 119:148) 'My eyes are awake before the night watches. How is this possible? At midnight; because the night is divided into four watches, [midnight is therefore after two watches.]" But R. Nathan explains it by the statement of R. Joshua; as we are taught that R. Joshua says: "It is the custom of kings to rise on the third hour of the day. [i.e., six hours of the night and two hours of the day together make two night watches of four hours each]. R. Ashi said: "One watch and a half are also called watches (plural)."