1) What regulates the 24-hour sleep-wake cycle in humans? a) Digestive system b) Circadian rhythms c) Hormonal balance d) Muscle activity 2) Which hormone is released during the day to keep us awake? a) Melatonin b) Dopamine c) Cortisol d) Serotonin 3) What triggers the release of melatonin? a) Sunlight b) Physical activity c) Darkness d) Sound 4) What part of the body receives a fifth of the blood supply during sleep? a) Heart b) Brain c) Lungs d) Liver 5) What role does sleep play in memory? a) Creates short-term memories b) Deletes all unwanted memories c) Consolidates long-term memories d) Enhances multitasking ability

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