Less than five hours and more than nine hours of sleep harmful?

 A new US study warns that sleeping five hours or less at night doubles the risk of developing dementia, and sleeping more than nine hours a night is dangerous.

Researchers at Boston University studied data from 2,812 American adults over the age of 65, who found that a “very short” sleep period that lasted five hours or less Gay doubles the risk of dementia.

According to the British newspaper ‘Daily Mail’, experts consider seven to eight hours of sleep to be beneficial for health.

In addition, the US National Health Service confirmed that most adults need six to nine hours of sleep each night. The American Sleep Foundation recommends that people aged 65 and over get seven to eight hours of sleep a night.

 According to lead researcher Dr. Rebecca Robbins, “Our research clarifies and confirms the link between poor sleep and the risk of developing dementia.”

Older people need to get adequate rest, they say, and they need to rest at night.


The researchers explained that “sleep disturbances and abnormal sleep periods, although modest, can lead to the development of Alzheimer’s disease.”

Recent research has also shown that people over the age of 65 who get a good night’s sleep and feel refreshed after waking up are better able to perform mental and cognitive functions.

Risk of death

The results of an analytical study of data collected over a five-year period show that there is a strong link between sleep disorders and dementia in general and dementia in general.

In addition, the risk of death increases with time.

Dr. Charles Chesler, lead author of the study, said the data confirms that sleep is important for mental health. It highlights the need for further research into the benefits of improving sleep and treating sleep disorders related to Alzheimer’s disease and the risk of death.

Danger of sleeping more than nine hours

On the other hand, a 2019 study found that people who slept nine or more hours a night had significantly reduced memory and language skills and an increased risk of developing dementia.

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