According to The Guardian, sleeping less than six hours every night is associated with a 12% increased risk of premature death. This finding comes from the systematic review and meta-analysis by University of Warwick researchers who analyzed data from 16 studies comprising over 1.3 million participants who were followed up for up to 25 years. This means that, although there was a strong relationship between inadequate sleep and early mortality, the study concluded that sleeping for more than nine hours a day can signal hidden health problems. The results are really well-supported with the size of the data set and the length of time over which it was observed, adding weight to the article's claims. More information about the study is available in the NIH article here: Sleep Duration and All-Cause Mortality: A Systematic Review and Meta-Analysis of Prospective Studies.
The American College of Cardiology also reports that sleep is an essential factor in heart health and overall well-being. According to an article by Nicole Napoli, young people who sleep better are progressively less likely to die prematurely. These data indicate that poor sleep patterns may contribute to as many as 8% of deaths from any cause. Interestingly, those who reported all five quality sleep measures-a score of five-had a calculated life expectancy 4.7 years longer for men and 2.4 years longer for women compared with those reporting none or one favorable sleep element. This shows how good sleep is essential for health and quality of life.
Link of sources: https://pmc.ncbi.nlm.nih.gov/articles/PMC2864873/
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