Human study · Aging · 29 Oct 2026
After a three-hour night, brain-network patterns moved in opposite directions at ages 20–30 and 65–75
Source: Simon Fraser University
What the research found
Simon Fraser University posted this on 29 October 2026. Josh Neudorf and colleagues report in Imaging Neuroscience that one night limited to about three hours of sleep moved brain-network patterns in opposite directions in adults aged 20 to 30 and adults aged 65 to 75. Some connections rose after the sleep restriction in the younger group and fell in the older group. The authors read the older pattern as more efficient modular connectivity. This study measured brain activity. It did not report cognitive test scores, and the university release did not state a sample size or a DOI, so those figures are not given here. The result is not a reason for older adults to sleep less. The same story includes separate commentary that chronic sleep loss is harmful and mentions heart disease, high blood pressure, diabetes, weight, and colorectal cancer. Those points are not results of this scan. Comments in the story about amyloid and dementia are also commentary, not findings from this experiment. Sex was not stated. Not medical advice.
Evidence level: Human study. A study in people, but an association isn't proof of cause.
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