1. Wall, usually perforated to allow free passage of air, supporting the joists of a timber ground-floor in the case of heavy loads or wide spans between the walls of the room.
2. Wall between two structural elements (e.g. piers) to prevent movement.
3. Wall supporting a sleeper.
"sleeper-wall." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (October 15, 2018). http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/sleeper-wall
"sleeper-wall." A Dictionary of Architecture and Landscape Architecture. . Retrieved October 15, 2018 from Encyclopedia.com: http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/sleeper-wall