Morning Person Linked to Higher Alzheimer’s Disease Risk

People who are at an increased risk of Alzheimer's disease may be more likely to be a morning person, have decreased sleep duration and other sleep disturbances, stated study published in the online issue of Neurology®, the medical journal of the American Academy of Neurology.

"We know that people with Alzheimer's disease often report depression and various sleep problems, like insomnia," said study author Abbas Dehghan, Ph.D., of Imperial College London in the United Kingdom. "We wanted to find out if there are causal relationships between different sleep patterns and depression and Alzheimer's."

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‘Morning person is associated with higher risk of Alzheimer’s disease.’

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To evaluate the relationship between different sleep patterns, major depressive disorder, and Alzheimer's disease, researchers analyzed the result of different genetic studies collected from databases that included: 21,982 people diagnosed with Alzheimer's disease who were compared to 41,944 without Alzheimer's disease; 9,240 with major depressive disorder who were compared to 9,519 without major depressive disorder; and 446,118 people with measurements of sleep-related characteristics.

Risk of Alzheimer's was determined based on genetic studies where Alzheimer's was diagnosed by autopsy or clinical examination.

Researchers analysed the genetic information using a study design called Mendelian randomization that can determine if there is cause and effect.

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Researchers found no evidence that sleep-related characteristics caused Alzheimer's disease. They also found no evidence of cause and effect between major depressive disorder and Alzheimer's.

Researchers did find a small association between the following: people with twice the genetic risk for Alzheimer's disease were 1% more likely to call themselves "morning people" compared to people at lower genetic risk; and people with twice the genetic risk of Alzheimer's had a 1% lower risk of insomnia. However, this effect of this association is small and shows only a possible link, not cause and effect.

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A limitation of the study was that most of the people in the study were of European ancestry, so the results may not apply to the people of different ethnicity.

Source-Eurekalert

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