長文読解（人文系・自然科学系の文章）- 問題101

Circadian rhythms, the internal biological clocks that regulate our sleep-wake cycles, have become a fascinating area of scientific research. These 24-hour cycles are controlled by a master clock in the brain called the suprachiasmatic nucleus, which responds to light and darkness signals from our environment. Recent studies have revealed that circadian rhythms influence far more than just sleep patterns.
Research conducted at major universities has shown that circadian disruption can significantly impact our immune system, metabolism, and cognitive performance. Shift workers, who regularly work during nighttime hours, often experience higher rates of cardiovascular disease, diabetes, and depression. Additionally, jet lag from international travel temporarily disrupts these natural rhythms, leading to fatigue and reduced mental clarity.
Scientists are now exploring therapeutic applications of circadian research. Light therapy, which involves exposure to bright light at specific times, has shown promise in treating seasonal affective disorder and improving sleep quality in elderly patients. Furthermore, researchers are investigating how meal timing and exercise schedules can help reset disrupted circadian rhythms.
Understanding circadian biology may revolutionize how we approach healthcare, work schedules, and daily lifestyle choices in the future.