People have a social obligation to conform to the general rules of sleeping: sleep at night, in a bed, in a private place away from public view, and in proper attire.
Physicians make patients aware of those interventions that they (the patients) may then refuse. In short, informed consent is less about patient decisions than it is about restraining physicians.
The U. S. health care system encourages patients to take more responsibility for their own treatment decisions and expects their doctors to cooperate in that effort. But the guidelines for exercising that responsibility remain very murky indeed.