Too much sleep might lead to faster decline in brain function.
A new study conducted by researchers from Columbia and the University Hospital of Madrid has found that people in their 60s and 70s who slept in average more than 9 hours a day showed a faster cognitive decline than people who slept less (6 to 8 hours a day).
Faster cognitive decline can lead to weaker cognitive abilities such as memory, concentration or attention and over time be an important risk factor to dementia.
Obviously, it is possible that people who were sleeping more during the study had already some cognitive issues which would explain those pre-existing sleeping patterns. In any case, sleeping too much or sleeping too little is not good for your brain health and cognitive development as an adult.
To keep your brain sharp, make sure to have a normal amount of sleep of 6 to 8 hours per night and start brain training regularly!