Research Shows High Nighttime Light Exposure Increases Depression Risk by 30%
Increased exposure to light at night may elevate the risk of mental disorders, such as anxiety and post-traumatic stress disorder (PTSD).
This is the conclusion of a new study conducted by scientists at Monash University (Australia), published in the journal Nature Mental Health.
Recent research indicates that nighttime light exposure increases depression risk – (Illustration: iStock).
The authors conducted an analysis of the largest study dataset to date, involving 86,000 participants. The analysis covered factors such as sleep light levels, sleep patterns, physical activity, and mental health.
The results revealed that among individuals exposed to high levels of light at night, the risk of depression increased by 30%. In contrast, those exposed to high levels of light during the day had a 20% reduced risk of depression.
The study also indicated similar outcomes for self-harming behaviors, mental disorders, bipolar disorder, generalized anxiety disorder, and PTSD.
According to the recommendations of the scientists, an effective non-pharmacological method to address these issues and improve mental health is to avoid exposure to light at night and increase exposure to light during the day.
Professor Sean Cain from Monash University, who led the research team, stated that the impact of nighttime light exposure is independent of demographic factors, physical activity, seasonal weather variations, and the job characteristics of participants.
“Our findings remain consistent when considering factors such as shift work, sleep, urban versus rural living, and metabolic disorders that affect cardiovascular health,” Mr. Cain noted.
Reverse Mechanism: More Light Exposure at Night Than During the Day! Mr. Cain pointed out that the human brain has evolved to function optimally in bright daylight while experiencing little to no light at night. However, today, humans challenge this biological mechanism by spending up to 90% of their daytime activities indoors under dim electric lighting. Simultaneously, they are exposed to excessive artificial light at night compared to the natural cycle of light and darkness. This disrupts the body’s biological mechanisms and affects health. |
