What do you think about sleeping in public?

Christopher Alexander writes in A pattern Language, in a pattern called, “sleeping in public,”

“It is a mark of success in a park, public lobby or a porch, when people can come there and fall asleep.”

In order to build places that achieve this success, he suggests,

“Keep the environment filled with ample benches, comfortable places, corners to sit on the ground, or lie in comfort in the sand. Make these places relatively sheltered, protected from circulation (that is, through-traffic of any kind), perhaps a step up, with seats and grass to slump down upon, read the paper and doze off.”

I know many universities have quads or “grassy knolls” where this often happens, and at my university the coffee shop and library have many couches in the middle of the spaces kind of enclosing their own space, where people often fall asleep while reading. They even feel comfortable taking off their shoes and curling up and such. It really lends a feeling of security and community to a place, a kind of humanity that makes it quite pleasant to browse for books, read, drink coffee, or have a quiet conversation.

What do you think of sleeping in public? Do you know any places that promote sleeping in public? If so, what are their architectural features. How would one go about making such places?