Take a nap in the day. Alzheimer's disease comes to you.
Release time:
2022-06-24
Is there a link between cognitive decline and excessive daytime napping (or napping)? According to a recent article published in Alzheimer's Disease and Dementia, a journal of the Alzheimer's Society, a new study from the Rush Alzheimer's Disease Center in the United States suggests a potential link.
The researchers say the link appears to be two-way. Longer and more frequent naps were associated with poorer cognitive performance one year later, while people with poorer cognitive performance slept longer and more frequently one year later.
Pathologies associated with cognitive decline can lead to other functional changes, according to Alan Buchman, MD, a neurologist at Rush University Medical Center and co-author of the article. In other words, Alzheimer's disease is not just a pure cognitive disorder, it is actually a multi-system disorder, which also includes sleep difficulties, movement changes, body composition changes, depressive symptoms, behavior changes, etc.
Researchers followed more than 1400 patients for 14 years. Participants wore a sensor on their wrists that recorded activity for 10 days, with annual checkups and cognitive tests. Any prolonged period of inactivity between 9 a.m. and 7 p.m. is considered to be a nap.
At the start, more than 75 percent of the participants did not show any signs of cognitive impairment, 19.5 percent had mild cognitive impairment, and just over 4 percent had Alzheimer's disease. Among those who did not experience cognitive impairment during the follow-up period, daily naps increased by about 11 minutes per year. Nap times doubled after being diagnosed with mild cognitive impairment and nearly tripled after being diagnosed with Alzheimer's disease.
The researchers also compared participants who were cognitively normal at the start of the study but developed Alzheimer's disease to those whose thinking remained stable during the study. They found that older people who napped for more than an hour a day had a 40 percent higher risk of developing Alzheimer's disease.
Buchman stressed that the study does not mean that napping causes Alzheimer's disease or vice versa. "This is an observational study, so we can't say 'a causes B '." But they unfold at the same time, and the same pathology may have an effect on both.
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