A survey of 1.1 million residents in the United States conducted by the American Cancer Society found that those who reported sleeping about 7 hours per night had the lowest rates of mortality, whereas those who slept for fewer than 6 hours or more than 8 hours had higher mortality rates. Getting 8.5 or more hours of sleep per night increased the mortality rate by 15%.
Severe insomnia - sleeping less than 3.5 hours in women and 4.5 hours in men - also led to a 15% increase in mortality. However, most of the increase in mortality from severe insomnia was discounted after controlling for comorbid disorders. After controlling for sleep duration and insomnia, use of sleeping pills was also found to be associated with an increased mortality rate.
The lowest mortality was seen in individuals who slept between six and a half and seven and a half hours per night. Even sleeping only 4.5 hours per night is associated with very little increase in mortality. Thus mild to moderate insomnia for most people is associated with increased longevity and severe insomnia is only associated with a very small effect on mortality.
As long as a patient refrains from using sleeping pills there is little to no increase in mortality associated with insomnia but there does appear to be an increase in longevity. This is reassuring for patients with insomnia in that despite the sometimes unpleasantness of insomnia, insomnia itself appears to be associated with increased longevity.
It is unclear why sleeping longer than 7.5 hours is associated with excess mortality.
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