High-quality deep sleep preserves cognitive abilities and memory in older adults, even in the presence of amyloid deposits, whereas short sleep (6 hours or less) in midlife is linked to increased cognitive decline.

noli's read

This advice is based on a solid scientific consensus regarding the protective role of deep sleep. Observational studies and long-term cohort follow-ups, such as those published in 'Nature Communications' or 'The Lancet Public Health', confirm that slow-wave deep sleep acts as a brain-cleansing and memory-consolidation mechanism. Research effectively shows that deep sleep can moderate the negative impact of amyloid plaques (associated with Alzheimer's) on memory, offering a form of cognitive resilience. The link between short sleep duration (≤ 6h) in midlife and an increased risk of subsequent dementia is also supported by robust epidemiological data. However, it is important to note that these are primarily correlations: while lack of sleep is a risk factor, it is not the sole determinant. The claim is therefore very well-supported scientifically and reflects the current state of knowledge regarding the neurobiology of sleep.

the sources

1. 1Watson NF et al. (AASM & Sleep Research Society) 2015
2. 2Hirshkowitz M et al. (National Sleep Foundation) 2015