“Sleeper walls” typically refer to a construction technique where a wall is built directly on top of a foundation or a base, often with a gap between the wall and the ground to allow for ventilation and to prevent moisture problems. This method is commonly used in situations where the ground is prone to dampness or where additional insulation is needed. The term can also sometimes be used in other contexts related to construction or architecture, so if you have a specific context in mind, let me know!
