A crew rest module for use in a mobile platform, particularly on commercial aircraft. The crew rest module in one implementation forms a pair of laterally adjacent crew rest compartments that each include a reclinable seat and a dedicated stairway for ingress and egress. The crew rest compartments are further elevated above a main floor of the cabin of a mobile platform to provide a degree of storage space underneath the crew rest compartments. Another embodiment provides a crew rest module having upper and lower crew rest compartments, with each compartment including a berth and a seat disposed laterally adjacent its associated berth. A stairway allows access to the upper crew rest compartment. Each of the modules provide a highly space efficient area that can accommodate a pair of crew members simultaneously and provide a degree of privacy for each crew member for rest and relaxation. The module further makes efficient use of the crown area of a commercial aircraft.