I have heard of the "Night Watches," where the night time is divided into 3 or 4 equal segments.
Mark 13:35, "Watch ye therefore: for ye know not when the master of t he house cometh, at 1)EVEN [(sunset) 6pm-9pm], or at 2)MIDNIGHT [9pm-12am], or at the 3)COCKCROWING [12am-3am], or in the...