What does the phrase 'does not make up for a lack of study' imply?
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: D. Sleep helps only when some study has already been done
- Step 1: If sleep cannot replace study, it can only help to fix material that was studied.
- Step 2: So there must have been study first.
Answer
Sleep helps only when some study has already been done.
Why not the others: The text never says sleep harms study or that study needs little sleep.
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