CNN: How long older adults sleep could affect their brain health, according to a study published Monday in the journal JAMA Neurology.

Disrupted sleep is common in late life, the study authors wrote, and associated with changes in cognitive function — the mental capacity for learning, thinking, reasoning, problem-solving, decision-making, remembering and paying attention.

Age-related changes in sleep have also been linked with early signs of Alzheimer’s disease, depression and cardiovascular disease, so the authors investigated possible associations between self-reported sleep duration, demographic and lifestyle factors, subjective and objective cognitive function, and participants’ levels of beta amyloid.

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