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According to Kripke findings, people who sleep between 6.5 and 7.5 hours a night live the longest.And people who sleep eight hours or more, or less than 6.5 hours, don't live quite as long. In other words, both sleeping too long and not sleeping long enough are associated with health risk. The big surprise is that what is defined as a long sleep seems to start at eight hours. Thus, sleeping 8.5 hours every night might actually be a little worse for a person's longevity than sleeping five hours.
This suggests that we should reconsider tha idea that the more sleep we get, the more beneficial is the effect on the mind and body. To feel our best, it is important to get a sufficient amount of restful sleep, and, at the same time, to keep in mind that sex or seven hours of sleep a night is plenty.
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