Read the following passage and answer the question below. Sleep is a fundamental biological process essential to physical health, cognitive function, and emotional well-being, yet many people fail to get an adequate amount of it. During sleep, the body repairs tissues, consolidates memories, and clears out toxins that accumulate in the brain during waking hours. Research has shown that chronic sleep deprivation is linked to a range of health problems, including obesity, weakened immune function, and an increased risk of cardiovascular disease. Sleep also plays a crucial role in learning, as the brain processes and stores information gathered throughout the day during certain sleep stages. Experts generally recommend that adults get between seven and nine hours of sleep per night for optimal health. Despite this recommendation, modern lifestyles involving excessive screen time, irregular schedules, and high stress levels have contributed to a widespread reduction in sleep quality and duration across many populations. Question: What is the passage mainly about?
- A. The effects of screen time on vision
- B. The stages of dreaming
- C. The history of sleep research
- D. The importance of sleep and the consequences of not getting enough of it ✓
Correct answer
D. The importance of sleep and the consequences of not getting enough of it
Explanation
The passage explains why sleep is important and what happens when people do not get enough of it.