Is sleeping more than nine hours per night not beneficial either? Scientists reach serious conclusions

A long and restful sleep seems to many like a sign of a healthy life. However, recent research by scientists from the University of Texas Health Science Center at San Antonio casts doubt on this view. According to their conclusions, sleeping for nine hours or more per night may, in some cases, weaken cognitive functions.

The results of this study were published in the journal Alzheimer's & Dementia. Researchers analyzed data collected in the framework of the large-scale Framingham Heart Study, which has been conducted in the United States since the middle of the 20th century. Data from 1,853 participants were studied—aged between 27 and 85 years—who had not been diagnosed with stroke or dementia.

The longer the sleep—the weaker the memory

Scientists conducted a thorough analysis of the sleep duration, mental state, and cognitive indicators of the selected group. It turned out that prolonged sleep is associated with a decline in overall mental activity, memory capacity, visual and spatial perception, and executive functions.

Interestingly, these negative effects were even more pronounced in individuals showing symptoms of depression, regardless of whether or not they were taking antidepressants. This demonstrates the existence of a deep connection between sleep, mental health, and brain function.

Depression and sleep problems—tightly interconnected

The authors of the study noted that depression often coincides with sleep-related disorders. Such a scenario can be predicted, as approximately 90% of people suffering from depression experience difficulties falling asleep or waking up.

Participants were divided into four groups based on their depressive symptoms and antidepressant usage. The greatest cognitive decline was observed among those who had prolonged sleep combined with symptoms of depression—this condition had a serious impact on their brain function.

Maintaining a normal sleep duration is important

Experts remind that for adults, 7–8 hours of sleep per day is considered the optimal norm. Sleeping less or more than this norm is one of the factors affecting cognitive health. However, this figure may vary depending on individual circumstances.

The editorial board of Zamin.uz continues to quickly and easily deliver scientific news regarding brain health, mental stability, and sleep hygiene. How do you feel about these findings? Could sleeping longer than recommended also negatively impact health? Read 'Zamin' on Telegram!