Dreaming about playing volleyball, especially with a coworker as the coach, can have several interpretations.

1. Teamwork and Collaboration: Volleyball is a team sport that emphasizes collaboration and communication. This dream may reflect your current work environment and the importance of working together with colleagues to achieve goals.
2. Leadership and Guidance: Having a coworker as a coach could symbolize your desire for guidance or mentorship in your professional life. This person may represent qualities you admire or aspects of their leadership style that you wish to emulate.
3. Competition and Performance: If you felt competitive or anxious during the game, it might indicate feelings about competition in your workplace. You may be assessing your performance or the dynamics between you and your coworkers.
4. Social Interactions: This dream could also highlight your social interactions and relationships at work. It may suggest a need to strengthen your connections with your colleagues or explore new dynamics within your team.

Consider how you felt during the dream and your current work situation for a more personalized interpretation. If you're experiencing stress or challenges at work, it may be beneficial to address these feelings directly in your waking life.