Of course this practice is not unique to the Portland area but something people do in all parts of the world. But sleeping this way is so much more dangerous when your country is occupied by foreign troops. Which brings us to Bush's War on Iraq.
As a consequence many Iraqis are sleeping on the roofs of their houses. Unfortunately, someone forgot to tell the U.S. occupiers, who grew up with air conditioning, about this practice. So, the other night U.S. pilots notice a lot of Iraqis laying on rooftops. What could this be? Obviously, they are "terrorists"! U.S. jets to the rescue. The pilots fire their guns at the people sleeping on their roofs killing 11 and wounding dozens of others.
Here is the link: http://americablog.blogspot.com/2006/07/bush-brags-on-tv-today-about-great.html