What is the main idea of the passage about sleep and memory?
When we learn something new, the brain does not store it at once in its final form. During sleep, and particularly in its deeper stages, the brain replays the day's experiences and strengthens the connections that matter. Researchers have found that students who sleep after studying often remember more than students who stay awake for the same period. Sleep does not make up for a lack of study, but it helps to fix what has been studied. Staying up all night before an exam may therefore be a poor trade, since the hours gained for study may cost more in lost memory than they give.
Answer and explanation
Correct answer: C. Sleep after studying helps the brain keep what was learned
- Step 1: Most sentences explain what sleep does to new learning.
- Step 2: The conclusion that all-night study may be a poor trade supports the same idea.
Answer
Sleep after studying helps the brain keep what was learned.
Why not the others: The brain is described as active during sleep, and the passage does not discuss exam timing or night study as an advantage.
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