Melatonin production and sleep-wake cycle involve which daily cycle?

Melatonin production and sleep-wake cycle involve which daily cycle?

• A. Digestive cycle
• B. Sleep-wake cycle
• C. Circulatory cycle
• D. Respiratory cycle

Answer: (B)

Melatonin production is tied to our roughly 24-hour timing system that governs when we feel sleepy and when we wake. This is the sleep-wake cycle, the body's daily rhythm that aligns with day and night. In darkness, melatonin rises to help you sleep; light exposure lowers melatonin to promote wakefulness. Other cycles like digestion, circulation, or respiration govern different bodily processes and don’t determine when you sleep. So the daily cycle involved is the sleep-wake cycle (the circadian timing of sleep and alertness).

Melatonin production is tied to our roughly 24-hour timing system that governs when we feel sleepy and when we wake. This is the sleep-wake cycle, the body's daily rhythm that aligns with day and night. In darkness, melatonin rises to help you sleep; light exposure lowers melatonin to promote wakefulness. Other cycles like digestion, circulation, or respiration govern different bodily processes and don’t determine when you sleep. So the daily cycle involved is the sleep-wake cycle (the circadian timing of sleep and alertness).