Judgment of the Court (Sixth Chamber) of 4 May 2023.#OP and Others v Glavna direktsia 'Pozharna bezopasnost i zashtita na naselenieto' kam Ministerstvo na vatreshnite raboti.#Requests for a preliminary ruling from the Rayonen sad - Kula.#Reference for a preliminary ruling – Social policy – Organisation of working time – Directive 2003/88/EC – Article 1(3) – Scope – Article 8 – Article 12 – Health and safety of night workers at work – Level of protection for night workers appropriate to the nature of their work – Directive 89/391/EEC – Article 2 – Public sector workers and private sector workers – Article 20 of the Charter of Fundamental Rights of the European Union – Equal treatment.#Joined Cases C-529/21 to C-536/21 and C-732/21 to C-738/21.