Hi first let me help you understand how dreams work. There are many theories of why we dream. Here I am explaining one of it to you that seems the most plausible according to me. Throughout the day we have many thoughts and we see many things however we cannot pay attention to each one of those. But subconsciously your brain is registering all of it. So you may not have actively thought about your boss on a particular day but something that you might have seen must have reminded you of your boss at a subconscious level that you are not completely aware of. At night when we sleep our brain organises all the information we have received throughout the day. The dreams we see are the flashes of this organising.

Dreams are part and parcel of mind, in your day it keeps thinking and you react to them. While working in your office, it involves in problem solving. When you are ideal, it starts thinking about either some experience which gave you pleasant feeling or unpleasant feeling. It runs and jumps from one situation to another without any logic. And you put efforts every moment to bring it back solve issues when you are at work to complete the project. It means when mind is active, it retrieves all the information, it process all the information and manipulates all the information without any rational reasons to it and there might be some logical reasons also. If your day is fully lived and indulged you will definitely get sound sleep. If you train your mind to witness and live in this moment by ignoring the past and future then there will be maximum possibility of getting peaceful and dreamless sleep. You can reach out any counselor for further discussion. Good luck