I would point out that the government, some religious extremists, and big corporations are using sonic techniques to make suggestions to sleeping indiviuals today, mostly those they consider have some influence and would like to bring under control. Consider it a form of advertising (hypnotic suggestion) to the sleeping
victim, like advertisment to a person of diminished capacity or logic/reason. The step from doing this to individuals to mass public would be made easier in a crisis situation, where ethics would be suspended, just as logic is suspended during sleep. the government would use the greater good argument. mass media like twx would make handsome profits helping to provide this service.