This evening I’m going to tuck my five-year-old into bed and read her a chapter from one of her princess books, followed by a summary of research recently presented at the annual congress of the European Society of Cardiology. Once upon a time, I’ll tell her, there was a scientist called Dr Nawon Lee who authored a study that found having a weekend lie-in may be very good for you and can protect against high blood pressure. Our accomplished protagonist Dr Lee said: “People should not feel lazy or guilty for sleeping a little longer on the weekend.” And........

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