다음 글의 주제로 가장 적절한 것은? 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.