Very different results may have been obtained if the studies had assessed younger or middle-aged populations. Where did the story come from? Its findings do not mean that not getting the standard amount of sleep will result in an early death. However, there are some unavoidable limitations due to the nature of the research question and the studies included. Meta-analyses combine similar studies, but these have often used different methods. The risk ratios for death by sleep category were obtained from the individual studies, and a combined risk was calculated. This is a large, well-conducted review of studies looking at the relationship between sleep duration and death. Of the 16 studies, 15 involving 25 cohorts; 1,, adults; and , deaths were suitable for inclusion in a meta-analysis looking at the association between short sleep and death. The researchers also carried out sub-group analyses by age, gender, socioeconomic status, definitions of sleep duration, and length of follow-up.
Though a causal relationship is possible, the underlying reasons for poor sleep patterns and their possible relation to physiological changes in the body also need consideration. Conclusion This well-conducted systematic review examined the association between sleep duration and all-cause mortality. Most healthy adults sleep for an average of seven to nine hours a night. The possible confounders that the studies were adjusted for also varied. All studies assessed sleep duration by questionnaire, and all assessed the outcome of death through death certificates. Its findings do not mean that not getting the standard amount of sleep will result in an early death. Statistical methods were used to take into account the differences between the studies. Where did the story come from? Meta-analyses combine similar studies, but these have often used different methods. As you get older, it is normal to need less sleep. Standard sleep the reference category: These covered a total of 1,, adults from eight different countries. Of the 16 studies, 15 involving 25 cohorts; 1,, adults; and , deaths were suitable for inclusion in a meta-analysis looking at the association between short sleep and death. This is interesting and informative research. Sleep categories varied between studies: What kind of research was this? However, there are some unavoidable limitations due to the nature of the research question and the studies included. How did the researchers interpret the results? A causal relationship is possible, and more plausibly so in cases of extreme sleep deprivation. The study was funded in part by an EC Grant. It has numerous strengths, one of which is that it explicitly outlined its review methods. This type of review is the best way of assessing the current evidence for a potential association — in this case, between duration of sleep and death. The authors searched several major medical databases for all published cohort studies on sleep duration and death from any cause all-cause mortality. Across the studies, there were , deaths during follow-up. It also included a large number of studies in a total of 1,, adults, capturing , deaths during follow-up.
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