While lack of sleep has long been linked to poor physical and mental health, a recent study by researchers at the University of Texas has found that excessive sleep can also impair brain function, particularly in individuals already dealing with depression.
The study, published in the scientific journal Alzheimer's & Dementia, analyzed sleep patterns and mental performance in 1,853 adults aged between 27 and 85 years. Participants were divided into four distinct groups:
- Those without depression
- Those not using any antidepressants
- Those diagnosed with depression
- And individuals suffering from depression who were also taking medications
Researchers discovered that individuals who regularly sleep 9 hours or more per night displayed reduced cognitive abilities, including weakened memory, attention span, and learning capacity. Interestingly, even participants without depression experienced negative effects from oversleeping, though to a lesser extent.
The findings are particularly concerning for individuals with existing mental health conditions. The study showed that extended sleep durations not only slowed down cognitive functions but also potentially increased the risk of worsening depression.
Researchers emphasized that the quality and duration of sleep are closely tied to brain health, and disruptions, whether too little or too much, could contribute to long-term neurological issues such as cognitive decline and Alzheimer's disease.
According to the study’s authors, the optimal sleep duration for most adults is between seven and eight hours per night. Straying too far from this range—either sleeping too little or too much—could be a warning sign of underlying mental or physical issues.
