The Relationship Between Sleep and Brain Function in Older Adults With Chronic Kidney Disease and Self-Identified Cognitive Impairment.
Mary Hannan, Thanakrit Jeamjitvibool, Qingfei Luo and 5 others
PMID 37379049WHAT IT FOUND
In older adults with kidney disease and self-reported memory issues, those who slept less than 7.4 hours scored better on attention and memory tests.
However, poor sleep continuity was linked to reduced brain blood flow and white matter integrity. These findings are exploratory and do not prove causation.
Key findings
01Sleeping less than 7.4 hours was associated with better scores on tests of attention and learning/memory compared to sleeping more than 7.4 hours.
02Indicators of poor sleep continuity, such as lower sleep efficiency, were associated with worse global cerebral blood flow and white matter integrity in the cingulum.
03Better self-rated sleep was associated with worse executive function scores, contradicting the objective data and suggesting self-report may be unreliable in this group.
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The study was cross-sectional, so it cannot determine if sleep problems cause cognitive/brain changes or vice versa. The sample size was small (n=37) and exploratory, with no power calculation. Multiple comparisons were made without statistical correction, increasing the risk of false positives. Self-identified cognitive impairment was the inclusion criterion, which is subjective and may not match clinical diagnosis. Data was secondary from a pilot trial, limiting the available variables and excluding some sleep disorders like apnea.
The easy way to misread this
Do not interpret the finding that shorter sleepers had better cognitive scores as evidence that sleep restriction is beneficial. The study is cross-sectional and exploratory; these associations may reflect confounding factors or reverse causality, and poor sleep continuity was still linked to negative brain health markers.