
12/03/2024
Aim for 7-8 hours of restorative sleep for long term cognitive health
How does the amount of sleep we get impacts our thinking and memory? đź§ đź’¤
Over the last decade, there's been a lot of research on how sleep affects brain health. This large study involving over 20,000 people from the UK and China found that both too little sleep (4 hours or less) and too much sleep (10 hours or more) can lead to worse memory and thinking skills over time. This kind of sleep pattern creates an inverted U-shaped curve when we plot it, showing that there is actually a specific range that may be best for cognitive health.
The study confirmed that not getting the right amount of sleep could affect our brain functions, but the effect is small. The study suggests that the length of sleep might affect people differently in different cultures due to various factors like lifestyle, genetics and social determinants of health, and more research is needed to understand these differences fully.
Finally, the study suggests that both short and long sleep might not only be a sign of declining brain health but could also contribute to it. However, understanding why and how requires more research. Ultimately, the impact of sleep and cognition needs to go beyond sleep duration - both sleep quality and sleep quantity should be considered in developing prevention strategies for dementia.
The study adds to the evidence that getting the right amount of good-quality sleep is important for keeping our brains healthy as we age.
Reference: Ma, Yanjun, et al. "Association between sleep duration and cognitive decline." JAMA (2020). PMID: 32955572