A STUDY published today found that people who sleep less tend to be fat, and experts said it was time to find out if more sleep would fight obesity. "We've put so much emphasis on diet and exercise that we've failed to recognise the value of good sleep," said Fred Turek, a physician at Northwestern University in the US. "In fact society emphasises just the opposite", he said, pointing to workplaces where long work days were common. Today's study from Eastern Virginia Medical School in Norfolk covered 1000 people and found that total sleep time decreased as body mass index...