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Study Reveals Weak Circadian Rhythms Doubles Dementia Risk

1/2/2026

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Summary

Story summary

A Neurology study links weak, fragmented circadian rhythms to more than double dementia risk.
The researchers tracked nearly 2,200 participants with an average age of 79 over three years.
Among those with weak rhythms, 106 of 727 developed dementia, versus 31 of 728 with strong rhythms.
Those whose daily activity peaked later in the day faced higher risk, and light-therapy could be explored as an intervention.

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Story summary

A Neurology study links weak, fragmented circadian rhythms to more than double dementia risk.
The researchers tracked nearly 2,200 participants with an average age of 79 over three years.
Among those with weak rhythms, 106 of 727 developed dementia, versus 31 of 728 with strong rhythms.
Those whose daily activity peaked later in the day faced higher risk, and light-therapy could be explored as an intervention.