"Sleepless Night" is a French police thriller, following a cop who is transformed into a relentless fighting machine after his son is kidnapped. That the cop is crooked and the kidnappers are drug dealers are only footnotes; the plight of the kid wins our sympathy during his dad's agonizing 24-hour ordeal.
French action star Tomer Sisley is a cop named Vincent, who is seen in the opening scene stealing a flight bag filled with cocaine from runners for a Parisian drug lord. This happens in full daylight after a car chase in the city, indicating rather cursory pre-planning. Indeed, much of Vincent's strategy is based on desperate improvisation.
Cut to the suburban nightclub headquarters of Jose Marciano (Serge Riaboukine), the powerful drug dealer whose men have kidnapped Vincent's son, Thomas (Samy Seghir), and want to trade him for the drugs. Vincent goes to Marciano's nightclub, a seemingly endless labyrinth of rooms, stages, bars and restaurants, where most of the film will take place. He's followed there by two other cops from Internal Affairs.
He hides the bag, and his hiding place is found by one of his police pursuers, Alex (Dominique Bettenfeld), who moves it to another hiding place. This sets up a desperate three-way situation in which Vincent and the dealers are searching the club for the bag and one another, while Alex and her partner seek Vincent.