IF your home resonates to nightly snoring, it could be because your family inherited a round-shaped head. Round-headed people tend to interrupt sleep with snoring more than those with long, thin faces, says a study at Case Western Reserve University in Cleveland, Ohio. There is now a hunt on for the "snoring genes" that influence head shape, says Dr Mark Hans, of the department of orthodontics at the university's school of dentistry. Before the study, age, sex and obesity were used to predict chronic snoring. Now his team has used the shape of a person's head as one indicator of ...