Multiple Choice, Single Answer
1 questions. Answer them all, then submit once for your section score.
Read the passage and answer the question.
Workers assigned to permanent night shifts face health consequences that extend well beyond simple tiredness. Because human circadian rhythms evolved around daytime activity, the body's internal clock continues to prepare for sleep during night work and for wakefulness during the day, regardless of a worker's schedule. Over years, this persistent mismatch has been associated with elevated risks of cardiovascular disease and metabolic disorders, effects that daytime workers rarely experience to the same degree. Some employers have introduced rotating schedules intended to distribute the burden more evenly among staff, yet occupational health researchers caution that frequent rotation can worsen outcomes for some individuals by preventing the body from adapting to any single rhythm at all, leaving workers perpetually out of sync.