Sleeping more than 8 hours is risk factor for cognitive impairment in over 65s

Cognitive impairment, often age-related, is associated with dementia. 35.6 million people worldwide suffer from dementia and given the progressive aging of the population 100 million cases are expected in 2050, according to the World Alzheimer Report. In Spain the prevalence of cognitive impairment varies between 10.1% and 26.9 % of the population over 65 years-old depending on the region and survey methodologies.

In the study conducted by the CEU University in Valencia symptoms of cognitive impairment were detected in 12% of cases. In total 245 patients over 65 both from rural and urban areas have voluntarily participated in the study monitored by their local pharmacists.

According to the authors of this study in addition to genetic factors, cognitive decline is also linked to risk factors such as age and others related to lifestyle, such as physical exercise, hours of sleep or intellectual stimulation. In the case of age, the study has found that the prevalence of recorded cognitive impairment shows a 9% increase each year, which means that every ten years the risk of suffering this illness doubles.

The study also showed that the lack of reading habit increases the risk of cognitive impairment 3.7 times and to only read occasionally increases the risk 2.5 times. Regarding sleep, researchers have found that sleeping less than 6 hours or more than 8 increases the risk of cognitive impairment by 2.6. Both chronic insomnia and daytime sleepiness are therefore risk factors associated with cognitive impairment and dementia.

The research team was led by Prof. Lucrecia Moreno. Currently the team has begun a second phase of the project which consists of designing a health intervention programme aimed at improving cognitive function and lifestyles related to cognitive impairment in these patients. 42% of them have accepted to participate in a health education program to promote cognitive training, exercise and sleep hygiene which are all key elements in old-age dementia prevention.