According to the passage, what does the brain do during sleep?

Scientists have long known that people who sleep badly find it harder to learn. During sleep the brain does not simply rest. It replays the events of the day and moves important memories into long-term storage. In one study, students who slept after studying a list of words remembered more of them the next day than students who stayed awake for the same period. This does not mean that sleep alone creates knowledge: students still have to study first. But it suggests that the common habit of studying all night before an exam may be less useful than a few hours of study followed by a full night of rest.

Answer and explanation

Correct answer: C. It replays the day and stores important memories in the long term

  1. Step 1: Find the sentence that begins 'During sleep'.
  2. Step 2: It says the brain replays the day and moves memories to long-term storage.
Answer
It replays the day and stores important memories in the long term
Why not the others: The passage rejects the idea of simple rest and does not say knowledge is created by sleep alone.

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