What is the passage mainly arguing?

Sleep is an active part of learning, not simply a rest afterwards. (Every paragraph builds the claim that memory is copied and fixed during sleep, ending with 'It is the second half of learning itself.')

What do researchers see in the brains of sleeping animals?

Firing patterns from the day's tasks running again in compressed bursts. (The second paragraph states this directly: the same patterns of firing from the day's tasks, run again in compressed bursts.)

Two students study the same material. Alba studies for two hours and sleeps eight. Ben studies for four hours and sleeps four. What does the passage suggest?

Alba may remember more, because her brain gets more time to file what she read. (The passage says extra reading buys material the brain has no time to file, and that sleepers recall more than those who stay awake.)

In this passage, 'fragile' describes a memory store that is:

easily lost or damaged (The fragile store is contrasted with a 'more durable' one, so fragile means easily lost, not lasting.)

What Sleep Does With The Day: Level 3 Reading Comprehension Questions

Sleep looks like a pause, but the brain does not stop. In the hours after learning, it replays the day.

Researchers who record brain activity in sleeping animals see the same patterns of firing that appeared during the day's tasks, run again in compressed bursts. The idea, supported by many experiments, is that a new memory first sits in a fast, fragile store and is slowly copied into a slower, more durable one. Sleep is when much of that copying happens.

Human studies point the same way. People who learn a list of words and then sleep remember more of it than people who learn the same list and stay awake for the same number of hours. The advantage is not simply time away from the material; a nap of an hour or two can produce it, while the same hours spent awake and busy usually do not.

This is why an all-night session before an exam is a poor trade. Extra hours of reading buy material that the brain is given no time to file. That filing is called consolidation, and it is not a luxury added after learning. It is the second half of learning itself.

Comprehension questions