In my opinion, there are two reasons. One is that people in the workplace are under great pressure, not only from external competition, but also from their own pressure. Many people are afraid of being eliminated or competing with their colleagues, so they have great psychological pressure and set high goals for themselves, such as creating a supervisor position this year, which leads to poor sleep quality for many people. The second is that many people will have a lot of jobs in the workplace. If they can't finish it or are afraid of not finishing it well enough, many people will be scared when they sleep. I'm afraid I can't finish this task because of my lack of ability.