A recent dissertation study indicates a troubling correlation between longer sleep durations—specifically nine hours or more—and cognitive impairments in middle adulthood and old age. It emphasizes that longer sleep was linked to weaker memory, learning capabilities, and attention compared to the recommended seven to nine hours of sleep. Moreover, difficulties in staying asleep and unrefreshing sleep were also associated with impairments in cognitive function, indicating that sleep quality is just as important as sleep quantity.

The researcher, Tea Teräs, points out that the findings suggest adhering to sleep guidelines could serve to protect cognitive functions as individuals age. The study builds on previous research that similarly observed this connection among a broader adult population, reinforcing the idea that not only the quantity of sleep but also its quality plays a crucial role in cognitive health. This underscores the importance of maintaining healthy sleep habits especially as one progresses into later stages of life.

Additionally, the dissertation mentions that other lifestyle factors, such as high alcohol consumption and poor dietary habits, can adversely affect cognitive function. In contrast, engaging in regular exercise and maintaining social relationships were noted to enhance cognitive abilities, indicating a complex interaction between lifestyle choices and cognitive health. These findings provide crucial insights for public health recommendations focused on improving sleep hygiene as part of cognitive maintenance in aging populations.