It’s important to sleep in the dark.
A recent study suggests that high levels of nighttime light pollution could be linked to an increased risk of Alzheimer’s disease, particularly among individuals under 65. According to research published on September 5 in Frontiers in Neuroscience, exposure to nighttime light has been found to be a more significant risk factor for early-onset Alzheimer’s compared to other factors such as alcohol abuse, kidney disease, and obesity. This association is particularly pronounced in people younger than 65, where high nighttime light intensity was identified as the leading risk factor.
The study, led by Robin Voigt-Zuwala from Rush University Medical Center, analyzed data from light pollution maps across the U.S. and compared this with national Alzheimer’s disease statistics and known risk factors. While light pollution does pose a risk for older adults, other factors like diabetes and high blood pressure remain stronger influences. However, for those under 65, exposure to nighttime light emerges as a critical risk factor.
Voigt-Zuwala suggests that the increased sensitivity of younger individuals to nighttime light might be due to genetic factors or lifestyle differences. Younger people are more likely to live in urban areas with higher levels of light pollution, which could contribute to their heightened vulnerability. The study theorizes that genetic predispositions affecting how individuals handle biological stressors might also play a role.
In light of these findings, the researchers recommend practical steps to reduce nighttime light exposure. Measures such as using blackout curtains or eye masks during sleep can help mitigate the effects of light pollution. Additionally, minimizing exposure to blue light and using dimmers at home could also be beneficial. These simple adjustments are especially useful for those living in areas with significant light pollution.
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