A 2011 study published in the journal Sleep that measured cognitive function in participants aged 45 to 69 found that an increase from seven or eight hours of sleep was associated with lower scores on most cognitive function tests. According to the study, the magnitude of these effects was equivalent to a five- to eight-year increase in age. Dr. Lim says that it's not uncommon to find that individuals who sleep for very long periods of time are at higher risk for various sorts of negative outcomes. According to Dr. Lim, this includes all-cause mortality and cognitive decline. A long sleep duration is typically defined as more than nine or 10 hours of sleep daily.
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