Rest and Sleep: Physiology, Disorders, and Health Implications

Which brain structure acts as the primary control center for sleeping and waking?

During which stage of sleep do pulse, respiratory rate, blood pressure, metabolic rate, and body temperature increase, while skeletal muscle tone and deep tendon reflexes are depressed?

A patient reports difficulty falling asleep, frequent awakenings during the night, and feeling tired during the day despite adequate opportunity to sleep. Which sleep disorder is most likely?