It has been known that cognitive decline is delayed in older people who sleep around 6 to 8 hours at night, and this keeps the brain performing. According to a study conducted in the USA, just as much sleep as less sleep has a negative effect on cognitive performance.
The study, published in the journal Brain academy, examined the relationship between length of sleep and cognitive decline in later life. The sleep of 100 older adults was tracked.
As a result of the research, it was found that those who only slept six to eight hours maintained their brain function. The study found that “six to eight hours of sleep in the elderly delays cognitive decline.”
Less than 5.5 hours of sleep has been found to decrease cognitive performance. The same goes for people who sleep more than 7.5 hours.
The researchers identified the importance of sleep quality for cognitive health.
It has been found that getting up frequently at night for reasons such as noise interrupts the sleep cycle and deprives the body of the restful sleep it needs.
Head of the Department of Sleep Medicine at the University of Washington, Dr. “Our study shows that there is an ideal length of sleep where cognitive performance is stable over time,” said Brendan Lucey.
According to the U.S. Centers for Disease Control and Prevention, school-age children should get 9 to 12 hours of sleep, while adults should get at least 7 hours a night.
However, it is found that the elderly generally have difficulty getting 7 hours of uninterrupted sleep due to chronic medical conditions and medications that can wake them up.
Another study published in September found that older people who slept less than 6 hours a night had elevated levels of amyloid beta, a marker of Alzheimer’s disease.