People who sleep for seven hours a night live longest

BMJ 2002; 324 doi: http://dx.doi.org/10.1136/bmj.324.7335.446/e (Published 23 February 2002)
Cite this as: BMJ 2002;324:446.6

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  1. David Spurgeon
  1. Quebec

    A study of the sleep habits of more than one million people over six years seems to debunk the popular idea that eight hours of sleep nightly are required for optimal health. Those who had six or seven hours had a lower death rate than those who regularly slept eight or more hours—or less than four.

    The study included adults aged 30 to 102 years and was carried out by researchers from the University of California at San Diego School of Medicine and the American Cancer Society. It was conducted from 1982 …

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