They can be on ground level or on a higher storey and on any side of a home.
A sleeping porch allows residents to sleep on a screened-in porch, avoiding warm convection currents from air and wall materials beneath or beside.
Before affordable electric fans and/or air conditioning were installed, families often created such rooms, well-aired, where children would sleep during summer.
The idea gained popularity in the early 1900s and became common in much of the United States.
This article related to a type of room in a building is a stub.