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According to the researchers, the understanding is that poor sleep isn’t a symptom of early dementia, particularly given the initial assessment of the participants that was conducted three decades prior. Having said that though, sleep duration could contribute to the development of dementia. Some posit that this could be due to the proteins that build up in the brain and are then flushed out during sleep, with this process unable to occur due to interrupted rest. Consequently, these pre-dementia protein build-ups continue, beginning about 15 to 20 years before the person exhibits memory and cognition problems.
As Dr Severine Sabia, an author of the study at the University of Paris, told The Guardian, “These findings suggest that sleep duration might be a risk factor for dementia in later life. I cannot tell you that sleep duration is a cause of dementia, but it may contribute to its development.”
Dementia affects around one in 14 people over 65 and one in six people over the age of 80. News of the impact of lack of sleep on individuals follows another study that found women who experienced disrupted sleep were at twice the risk of dying from heart disease.