Sleeping porch
A sleeping porch is a deck or balcony, sometimes screened or otherwise enclosed with screened windows, and furnished for sleeping in warmer months. 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. See also

Arizona room 
Screened porch

References

Rooms
Porch