If your dream featured your actual workplace and colleagues you work with everyday, it may have been highlighting your preoccupation with your job. It may also have been trying to draw your attention to a specific aspect of your job. You spend much of your time at work, so work is of considerable importance emotionally.
If you are comfortable at work, dreams of the workplace and the people with whom you work may become symbols of reassurance and reward; but if you are not comfortable at work, they can become symbols of frustration.
If you had a dream in which you were performing mindless repetitive tasks on an assembly line, perhaps you feel as if you are being treated like a mindless automaton in waking life or that others are making relentless demands on you. Or do you feel that you are losing your sense of identity in your job or that people in your life are taking you for granted?