Final answer:
Workers with rotating shift schedules, commonly found in healthcare and service industries, are most likely to struggle with circadian rhythm disruptions, resulting in various sleep-related issues and psychological stress.
Step-by-step explanation:
The worker most likely to experience the greatest difficulty with disruptions in their circadian rhythms is one engaged in rotating shift work. This type of schedule involves frequent changes to work hours, hindering a stable sleep-wake pattern and leading to sleeping problems, as well as potential signs of depression and anxiety. Workers in healthcare and service industries often face these challenges. To mitigate such issues, strategies like exposure to bright light during shifts and darkness when off work can help realign the biological clock with the external environment.