By Joe Morgan via SWNS
Seven hours of sleep is the Goldilocks amount for people in their middle age and upwards, according to new research.
Too little or too much sleep as we age is associated with poorer cognitive performance and mental health.
In a new study examining data from nearly half a million Brits and Chinese people aged 38 to 73, people were asked abut their sleeping patterns, mental health and wellbeing, and took part in a series of cognitive tests.
The team found both insufficient and excessive sleep duration were associated with impaired cognitive performance, such as processing speed, visual attention, memory and problem-solving skills.
Seven hours of sleep per night was the optimal amount of sleep for cognitive performance.
It was also good for mental health, with people experiencing more symptoms of anxiety and depression and worse overall wellbeing if they reported sleeping for longer or shorter durations.
Researchers say one reason is that when "deep" sleep is disrupted, it can cause a build of a protein called amyloid that can cause 'tangles' in the brain similar to some forms of dementia.
Additionally, lack of sleep may hamper the brain's ability to rid itself of toxins.
Previous studies have also shown that interrupted sleep patterns are associated with increased inflammation, indicating a susceptibility to age-related diseases in older people.
Professor Barbara Sahakian, from the University of Cambridge, said: “Getting a good night’s sleep is important at all stages of life, but particularly as we age.
"Finding ways to improve sleep for older people could be crucial to helping them maintain good mental health and wellbeing and avoiding cognitive decline, particularly for patients with psychiatric disorders and dementias.”
Professor Jianfeng Feng from Fudan University in China said: “While we can’t say conclusively that too little or too much sleep causes cognitive problems, our analysis looking at individuals over a longer period of time appears to support this idea.
"But the reasons why older people have poorer sleep appear to be complex, influenced by a combination of our genetic makeup and the structure of our brains.”
The research was published in the journal Nature Aging.
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