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Napping (午睡) is a great way to feel rested and alert (机警的) — and some research shows it can do good to our brain. Albert Einstein and Leonardo da Vinci were all famous nappers. However, you may want to consider how long you have to sleep before heading to bed for your middle napper.

If you need to be alert right after waking up, so-called “power naps” of 10-30 minutes are recommended. Longer naps may cause some sleepiness after you wake up and you need some time to feel better. But drinking coffee directly before a nap may help you wake up without feeling sleepy.

A recent study from China has even suggested that daily afternoon napping is connected with better cognitive function (认知功能) in older adults. The researchers asked 2,200 over-70s about their napping habits before testing their memory and language skills. They found that those who usually napped performed better than those who didn’t.

But nap length may make a difference here — a similar study showed that those who usually napped for 30-90 minutes had better overall cognition (认知) compared to those who napped for longer or shorter, or who didn’t nap at all. The reasons why short naps are so good for alertness are not well understood. It’s possible that napping helps the brain clean upsleep-inducing (助眠的) products that would otherwise inhibit brain activity.

Although napping has many advantages. It is not recommended for people who suffer from insomnia (失眠). That’s because naps may make those people harder to fall asleep when going to bed in the evening. Naps should also be avoided in situations where great performance is needed right after the nap, as it may take some time to fully wake up.

1．Why does the writer mention Albert Einstein?

A．To show famous people all love napping.

B．To prove napping is a great habit.

C．To encourage people to nap every day.

D．To advise readers to learn from him.

2．If you will take a math test right after noon, what should you do?

A．Avoid having a nap.

B．Have a two-hour nap.

C．Sleep for less than 10 minutes.

D．Drink a cup of coffee before your nap.

3．What can we learn about the study in the third paragraph?

A．All of the 2,200 participants (参与者) had napping habits.

B．The researchers did some tests on some old people.

C．Short naps have bigger influence than longer naps.

D．The older people are, the longer nap they need.

4．What do the underlined words “inhibit brain activity” mean?

A．To help the brain work better.

B．To stop the brain from working.

C．To make the brain less active.

D．To allow the brain to fall asleep.

5．Which question is answered in the last paragraph?

A．Who doesn’t need a nap?

B．Where can you have a good nap?

C．Why should everyone have a nap?

D．How long should you nap every day?