Inside the Bunk: How Cabin Crew Sleep and Rest on 19-Hour Flights
On ultra-long-haul flights, such as those lasting up to 19 hours, cabin crew are allocated mandatory rest periods to ensure they remain alert and effective. To facilitate this, modern long-range aircraft like the Airbus A350 and Boeing 777 are equipped with dedicated Crew Rest Compartments (CRCs). These hidden areas, typically located above or below the main passenger deck, feature bunks, privacy curtains, and other amenities. Crew members take shifts sleeping in these compartments, allowing for a seamless rotation that maintains service and safety standards throughout the world's longest journeys.
Official Source: https://simpleflying.com/how-cabin-crew-rest-sleep-19-hour-flights/