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.The Jewish night was divided in the time of Christ into 4 watches.
Mark 13:35 Watch ye therefore: for ye know not when the master of the house cometh, at even, or at midnight, or at the cockcrowing, or in the morning:
Roughly ‘even’ was 6pm to 9 pm; ‘midnight’ was 9pm to 12am; ‘cockcrowing’ was 12am to 3am and ‘morning’ was 3am to 6am.
I hope this helps.