Xiaoming gets up in the middle of the night to drink water, then turns off the lights and goes back to sleep. After waking up, he committed suicide.

This is a cold joke. A cold joke means that the joke itself is boring, homophonic, translated, or omitting the theme, different logic, judgment or special content, or because of the performer's mood or expression, and it is difficult to make people laugh, but it does not mean that the joke itself is boring, which is also a manifestation of humor.