Short sleep ups death risk, long indicates illness
Washington: People who sleep for less than six hours each night are 12 percent more likely to die prematurely than those who get the recommended 6-8 hours, a new study has found.
What’s more, the research carried out by the University of Warwick in collaboration with the Federico II University Medical School in Naples, Italy, claimed that consistent over long sleeping (over 9 hours a night) can be a cause for concern. While, unlike short sleeping, over long sleeping does not in itself increase the risk of death, it can be a significant marker of an underlying serious and potentially fatal illnesses.
The study has been published in the journal Sleep.
To reach the conclusion, boffins looked at the relationship between the level of habitual duration of sleep and mortality by reviewing 16 prospective studies from the UK, USA, European and East Asian countries. The study included more than 1.3 million participants, followed up for up to 25 years, with more than 100,000 deaths recorded.
The study provides unequivocal evidence of the direct link between both short (less than 6 hours sleep a night) and long (9 hours or more) duration of sleep and an increased chance of dying prematurely, compared to those who sleep 6-8 hours a night on average.
Professor Francesco Cappuccio, leader of the Sleep, Health and Society Programme at the University of Warwick and Consultant Physician at the University Hospitals Coventry and Warwickshire NHS Trust, said “whilst short sleep may represent a cause of ill-health, long sleep is believed to represent more an indicator of ill-health”.
He said: “Modern society has seen a gradual reduction in the average amount of sleep people take, and this pattern is more common amongst full-time workers, suggesting that it may be due to societal pressures for longer working hours and more shift-work. On the other hand, the deterioration of our health status is often accompanied by an extension of our sleeping time.”
“Consistently sleeping 6 to 8 hours per night may be optimal for health. The duration of sleep should be regarded as an additional behavioural risk factor, or risk marker, influenced by the environment and possibly amenable to change through both education and counselling as well as through measures of public health aimed at favourable modifications of the physical and working environments “ Professor Cappuccio added.
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