Article L3122-15 of the French Labour Code
A company or establishment agreement or, failing that, a collective branch agreement may introduce night work in a company or establishment, within the meaning of article L. 3122-5, or extend it to new categories of employees. This collective agreement or arrangement sets out : 1° The justifications for the use of night work mentioned in article L. 3122-1 ; 2° The definition of the period of night work, within the…