We all feel better, and can think more clearly, after a good night's rest. But new research underscores the importance of sleep quality and duration during middle age to stave off cognitive decline.
The study (subscription required) examines data compiled as part of the long-term Study on global AGEing and adult health (SAGE), which is funded by a joint agreement of the National Institutes of Health and the World Health Organization. The project began in 2007 and involves more than 30,000 individuals aged 50 and older across China, Ghana, India, Mexico, the Russian Federation and South Africa.
Among the key findings is that middle-aged or older people who get six to nine hours of sleep a night think better than those sleeping fewer or more hours, and that excessive sleep is equally damaging as too little sleep. In the above video, researchers discuss how despite cultural, environmental and economical differences, study results showed strong patterns relating to gender, sleep quality and cognitive function.