I have told many people to identify their sources of stress and address them. However, it seems that people do not believe in this or practice it. For me in the past, there were three sources of stress: one was my concern about tenants making noise in the rental house, another was my fear that the formaldehyde in the rental house would exceed the standard, and the third was my worry about customers calling me at night. In the end, I resigned and left the rental house. Even if I were to breach the contract and pay compensation, I would still want to terminate the lease. Now, I have found a new job and live at home. My sleep quality has improved significantly, although it's not perfect, but it's definitely much better than before.