Three Sleep Habits Linked to Early Brain Aging Markers

A UK Biobank study of about 23,000 middle-aged and older adults followed for roughly nine years found that sleeping outside the seven-to-nine-hour window (especially fewer than seven hours), frequent daytime napping, and sleeplessness each correlate with higher brain white matter lesion volumes on MRI, a marker linked to aging and dementia risk. After adjusting for vascular and lifestyle factors, snoring and unintentional daytime dozing did not show the same links. Short sleep showed a stronger association than long sleep, and while naps can aid alertness, frequent napping may signal underlying sleep problems. The researchers emphasize sleep as a modifiable risk factor that could help reduce brain aging and dementia risk, though nap duration details were not captured in this study.