Bedroom Community is a general name given to a place suburban area, which doesn't have a major employment center. People in that place are only known to sleep throughout and not working. People always choose bedroom communities, because the place is affordable.
The suburbs of many large cities could be called "bedroom cities ".Consider Chicago as an example. The cities of Kenosha Wisconsin, Zion Illinois, and even Waukegan Illinois, all are considered close enough for the commute to the 'Windy City ". :)