Stations probably have an arbitrary time that would be consistent to the station, but wouldn't necessarily align to any other time. Ships and stations would need people manning certain systems at all hours, so you wouldn't have 'day' or 'night' shifts, you'd just have arbitrary shifts.
You would have a work shift, then probably two shifts worth of time for leisure and sleep. Management would stagger shifts, so that they overlapped. Your shift is half way done when your counterparts shift starts, that way you wouldn't have security or maintenance vulnerabilities during shift changes.
The actual 'ship time' wouldn't really matter all that much, because there would always be people awake, and always be people asleep.