[9급 지방직 영어 2025년 15번]

The reason artificial blue light in devices can be so harmful in the evening is that it mimics the sun’s natural blue light―which confuses the body’s circadian clock. A study showed that viewing artificial blue light in the evening will push sleep-inducing melatonin hormones down drastically, disrupting bedtimes and affecting daytime behavior. But getting that same blue light from the sun, which contains a health-boosting full spectrum of light, does the opposite. According to the study, the more daytime blue light a person gets, the better defense they have against the harms of evening blue light from screens. Thus, packing the day with sunshine creates a blue-light build-up that helps counteract the consequences of that artificial light at night. In other words, the more sunlight exposure a child gets during the day, the better their brain can build a wall against the harms of artificial blue light later.