Can I call the police if someone knocks at the door in the middle of the night?

Legal analysis: it can be handled by the police. You are suspected of gaining sympathy and making trouble, breaking into other people's houses. The crime of stirring up trouble is defined as the crime of disturbing social management order in the criminal law. Generally speaking, going to an individual's home is not considered as a category of social public order, so it should not be regarded as the crime of picking quarrels and stirring up trouble, but should be convicted and punished for the crime of illegally invading the house. If property losses are caused, it may be suspected of intentional destruction of property.

Legal basis: People's Republic of China (PRC) Criminal Law.

Article 245 Whoever illegally searches another person's body or residence or illegally invades another person's residence shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention. Any judicial officer who abuses his power and commits the crime mentioned in the preceding paragraph shall be given a heavier punishment.

Article 293 Whoever commits one of the following acts of provoking troubles and disturbing social order shall be sentenced to fixed-term imprisonment of not more than five years, criminal detention or public surveillance: (1) beating others at will, if the circumstances are bad; (two) chasing, intercepting, insulting or intimidating others, and the circumstances are bad; (3) Violent extortion or arbitrary destruction or occupation of public or private property, if the circumstances are serious; (4) disturbing public order in public places. Whoever gathers people for many times to commit the acts mentioned in the preceding paragraph and seriously undermines social order shall be sentenced to fixed-term imprisonment of not less than five years but not more than 10 years and may also be fined.