midnight
Mezzanotte is the Italian word for midnight. It is used to refer to the exact moment when one day ends and the next one begins. For example, you might say "Buonanotte, ci vediamo domani a mezzanotte" which means "Goodnight, see you tomorrow at midnight".
We meet at midnight at the cinema.
This is a simple sentence structure that implies making a plan to meet someone at the cinema at exactly midnight.
The train leaves at midnight sharp.
This sentence is commonly used when talking about a scheduled departure time especially in transportation. In this case, the departure time for the train is exactly at midnight.
I can't sleep before midnight.
This phrase is commonly used to express difficulty in sleeping at early hours. The speaker suggests that they are unable to sleep until after the point of midnight is passed.