investigators of Washington University School of Medicine, in the United States, came to the conclusion that sleep 8 hours a night increases the probability of developing insanity. Every year 10 million new cases of this degenerative brain disease are diagnosed. For the study, 100 adults with a mean age of 70 years were observed. Patients were monitored over a five-year period, during which 12 people showed signs of cognitive decline, including one case of mild dementia. O Alzheimer it is the main cause of cognitive decline in the elderly and is the main form of dementia.
Throughout the study, participants were subjected to various tests in order to identify signs of cognitive impairment. The researchers followed four to six nights of sleep for the volunteers three years after the start of the study with the aid of an EEG machine. So experts found that, like too little sleep, too much sleep was a risk factor for an aged brain.
Duration or quality?
Sleeping less than 4.5 hours or more than 6.5 hours per night was more commonly observed in those who exhibited cognitive decline over time. The effect was similar to age, which is the great driving force behind dementia. “We know from previous research that lack of sleep is associated with cognitive decline,” said Greg Elder, senior professor of psychology and associate director of Northumbria Sleep Research. “But it’s less clear why prolonged sleep is associated with cognitive decline,” he added. “It may not necessarily be the duration of sleep that matters, but the quality of that sleep when it comes to the risk of developing dementia.”
Sleep quality refers to how long a person sleeps. I am profundo and restorative, which is vital for a number of reasons. The study also reveals that having less slow-wave or delta sleep – the type of sleep during which rapid eye movement (REM) sleep is recorded – is more harmful to brain health.
Senior co-author David Holtzman, MD, professor of neurology, said the study suggests that “sleep quality may be critical, as opposed to total sleep.” The first author of the study Prof Brendan Lucey says that “research suggests that there is an average range, or ‘ideal point’, for the total sleep time where cognitive performance was stable over time.” For the specialist, people who wake up feeling rested after little or many hours of sleep should not feel compelled to change their habits.
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