Yes, all airlines that fly flights long enough to require it bring two crews along. Whether or not there is a rest area is dependent on the airline and the aircraft itself. On some planes, it is located below the main deck floor built into the cargo hold.
In some, it is behind the galley in the back of Economy, and in some, it is above the ceiling in the passenger cabin. Or, for those airlines that don't buy the crew rest areas when they order their planes, blocks of First or Business seats are not sold - reserved for the crew. The crew that starts the flight ends the flight, normally.
Shortly in, they go off duty and rest, and are replaced. Closer to landing, they come back on duty.
Pilots are human also, they need to rest especially when they are responsible for the safety for all passengers. Both pilots and the cabin crew could take turn resting. In large aircraft for long haul flights, the crew can rest in sleeping position in their resting room so they can truly rejuvenate.
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