A new study published in Frontiers in Neuroscience highlights how exposure to artificial light at night (ALAN) could significantly increase the risk of Alzheimer’s disease.
Researchers found that prolonged exposure to night light pollution may contribute to cognitive decline, doubling the risk of developing Alzheimer’s in some cases.
The study examines how the brain responds to nighttime light exposure, revealing that ALAN can disrupt the body’s circadian rhythms, the internal clock that regulates sleep and other critical functions [1]. Disruption of these rhythms can lead to neurological issues, including Alzheimer’s.
The research points out how melatonin, a hormone crucial for regulating sleep, is suppressed by artificial light exposure, which affects the brain’s ability to clear harmful proteins linked to Alzheimer’s disease [2].
The findings suggest chronic exposure to ALAN interferes with sleep quality and the brain’s mechanisms to remove toxic beta-amyloid proteins. These proteins accumulate over time and form plaques, which are known to be a key feature of Alzheimer’s disease.
The study also identifies geographic areas with higher levels of night light pollution, emphasizing that individuals living in urban environments are at greater risk due to constant exposure to artificial lighting.
In addition to the higher Alzheimer’s risk, night light pollution is linked to other health concerns, including cardiovascular issues and obesity [1]. “Alzheimer’s disease (AD) prevalence has increased in the last century which can be attributed to increased lifespan, but environment is also important.”
Researchers recommend using blackout curtains, limiting electronic devices before bed, and reducing indoor lighting to protect the brain from potential harm associated with prolonged nightlight exposure and improve overall sleep quality.
This study emphasizes the need for greater awareness of light pollution’s potential health risks and offers actionable solutions for reducing its impact on brain health.
[1] Frontiers in Neuroscience. Outdoor nighttime light exposure (light pollution) is associated with Alzheimer’s disease
[2] The Scientific World Journal. Neurobiology, Pathophysiology, and Treatment of Melatonin Deficiency and Dysfunction
