The main leakage protector in the corridor where I live always trips at night.

Look at the wiring on the leakage protector. If the insulation skin at the joint has burnt marks, it means that the electrical appliances of each household have tripped due to excessive power. Look at what you said, it will only trip at night. I guess that's the reason. Of course, the leakage phenomenon of household appliances is not ruled out. It can be eliminated by elimination. In addition, the leakage protector also has a service life, so you should also pay attention to it.