Sleeping for less than six hours may cause early death, study finds

Sleeping consistently for less than six hours a night may cause an early death, but too much sleep could also mean problems, according to a study that claims to have found unequivocal evidence of the potential harm from abnormal sleep patterns.

It found that those who generally slept for less than six hours a night were 12% more likely to experience a premature death over a period of 25 years than those who consistently got six to eight hours' sleep. Evidence for the link was unequivocal.

"Whilst short sleep may represent a cause of ill health, long sleep is believed to represent more an indicator of ill health," said Professor Francesco Cappuccio, who led the study and is head of the Sleep, Health and Society programme at the University of Warwick.

"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.

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