[Dec 2, 2022: Staff Writer, The Brighter Side of News]
According to a new study, how long people sleep and when they go to bed could influence their risk of dementia.
The results were published in the Journal of the American Geriatrics Society.
Researchers from China, Sweden, and the United Kingdom found that sleep for more than eight hours increased dementia risk by 69%, while sleeping before 9 p.m. rather than 10 p.m. or later, increased dementia risk by two times.
Research in the future "may clarify whether moderately reducing [time in bed] and delaying sleep timing can help slow down cognitive decline and delay dementia onset in older adults," wrote Dr. Rui Liu, the lead author of the study, from Shandong University's Shandong Provincial Hospital in Jinan, China.
The researchers noted that the majority of studies on sleep and dementia have focused almost exclusively on White populations in North America and Europe.
The study noted that older Chinese citizens living in rural areas tend to go to bed earlier, wake up earlier, sleep less, and be more likely to develop dementia compared to Westerners and city dwellers, partly due to differences in socioeconomic status, culture, education, and lifestyle.
Multivariable-adjusted spline curves for associations of sleep characteristics with incident dementia (n = 1982). Solid lines represented hazard ratios of incident dementia, adjusting for age, sex, education, body mass index, alcohol consumption, smoking, hypertension, diabetes, dyslipidemia, coronary heart disease, stroke, and APOE genotype. The shaded areas represented the 95%CI. The histogram represented the distribution of study participants. CI, confidence interval. (CREDIT: Associations of sleep timing and time in bed with dementia and cognitive decline among Chinese older adults: A cohort study)
To try to bridge the knowledge gap, study participants were rural-dwelling, older adults, mostly low-income and with limited education, in western Shandong Province.
Associations of baseline sleep characteristics with MMSE score changes among participants who were free of dementia at follow-up, stratified by baseline age groups (60–74 vs. ≥75 years) and sex (n = 1845). Results were adjusted for age, sex, education, body mass index, alcohol consumption, smoking, hypertension, diabetes, dyslipidemia, coronary heart disease, stroke, APOE genotype, baseline MMSE score, and follow-up time. (CREDIT: Associations of sleep timing and time in bed with dementia and cognitive decline among Chinese older adults: A cohort study)
The link between sleep problems and dementia has, however, been found to be inconsistent in population-based studies, the researchers said.
Tips for Better Sleep
Good sleep habits (sometimes referred to as “sleep hygiene”) can help you get a good night’s sleep.
Some habits that can improve your sleep health:
Be consistent. Go to bed at the same time each night and get up at the same time each morning, including on the weekends
Make sure your bedroom is quiet, dark, relaxing, and at a comfortable temperature
Remove electronic devices, such as TVs, computers, and smart phones, from the bedroom
Avoid large meals, caffeine, and alcohol before bedtime
Get some exercise. Being physically active during the day can help you fall asleep more easily at night.