Which lifestyle factor could negatively affect sleep timing?

Irregular work schedules can negatively affect sleep timing because they disrupt the body’s natural circadian rhythm, which regulates sleep-wake cycles. When work hours vary significantly from day to day, it becomes challenging for the body to establish a consistent sleep schedule. This inconsistency can lead to difficulties in falling asleep and waking up at the desired times, resulting in poor sleep quality and overall fatigue.

In contrast, regular exercise typically promotes better sleep quality as it can help to manage stress and anxiety, which are often barriers to good sleep. A consistent bedtime routine reinforces sleep cues, signaling to the body when it's time to wind down, facilitating a smoother transition into sleep. Lastly, a healthy sleep environment, characterized by factors such as darkness, quietness, and comfort, supports restful and uninterrupted sleep. These factors work together to promote stable sleep timing, unlike irregular work schedules, which create confusion and disruption in the body’s sleep patterns.