Studies have found that excessive daytime naps may be an early sign of Alzheimer’s disease

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Napping for more than an hour or several times a day may be an early sign of Alzheimer’s disease, according to a new study. Studies have shown that excessive daytime napping has a two-way relationship with cognitive decline. It not only reflects the changes of the brain, but also shapes the changes of the brain.

The relationship between Alzheimer’s disease and sleep pattern interruption has been confirmed. Researchers have found that interrupted or fragmented sleep can accelerate the pathological signs of Alzheimer’s disease, but do daytime naps really pose a threat to long-term brain health?

Peng Li, co-author of the new study, said: “the daytime sleep behavior of the elderly is often ignored, and there is still a lack of consensus on daytime nap in clinical practice and health care.”

The new study looked at new data from an ongoing long-term project that tracked the memory and aging of more than 1000 older people. On 14 days of each year, participants wore a motion tracking device and counted naps by prolonged inactivity in the daytime.

The average age of each participant was 81 and they were followed for 14 years. Annual tests are used to measure cognitive decline.

The results show that there is an obvious two-way relationship between daytime nap and cognitive decline. In general, the frequency and frequency of naps increased with age, however, those diagnosed with Alzheimer’s disease doubled each year compared with those without Alzheimer’s disease.

“Longer and more frequent daytime naps are associated with a higher risk of Alzheimer’s dementia. Interestingly, more excessive (longer or more frequent) daytime naps are associated with poorer cognitive ability one year later, whereas poorer cognitive ability is associated with more excessive naps one year later,” the researchers wrote

So what comes first – excessive naps or cognitive decline?

The researchers describe the relationship as a “vicious circle” in which one affects another and vice versa. Those clinically diagnosed with Alzheimer’s disease showed an increase in the frequency and duration of subsequent naps, but those who were cognitively healthy at the beginning of the study were 40% more likely to develop Alzheimer’s disease within six years if they took a nap at least once a day or more than an hour a day.

Yue Leng, co-author of the study, said it was impossible to find the causal direction from this specific data set. At this stage, excessive daytime napping may directly accelerate brain aging, but it may also make napping a very early preclinical sign of Alzheimer’s disease.

“I don’t think we have enough evidence to conclude that napping itself leads to cognitive aging, but excessive daytime napping may be a signal to accelerate the aging or cognitive aging process,” Leng said. “It is very interesting for future research to explore whether napping intervention may help slow down age-related cognitive decline.”

Leng also noted that the association between daytime naps and cognitive decline was not affected by the quality of night sleep. The researchers adjusted for the amount and quality of night sleep, and the association still exists, suggesting that excessive daytime napping is not just a person making up for the fragmentation or interference of night sleep.

Kun Hu, co-author of the study, pointed out that the main implication of these findings is to monitor more closely the daytime sleep habits of the elderly. Hu said that over time, changes in nap habits may be a strong early signal of preclinical Alzheimer’s disease.

“Our hope is to draw more attention to daytime sleep patterns and the importance of patients paying attention to whether their sleep time changes over time. Sleep changes are crucial to shaping internal changes in the brain associated with circadian clocks, cognitive decline and the risk of dementia,” Hu said

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