Fortunately, newer airplane models, such as the Boeing 777 and 787, provide the crew with secret rooms known as Crew Rest Compartments (CRCs). These areas, which are accessible via hidden stairs and ladders, allow the pilots and flight attendants to get some valuable shut-eye during long flights.
Source: There’s a Secret Room on Airplanes That Flight Attendants Don’t Want You to Know About – Page 4 of 20