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4 Read the passage and choose the answer which best completes each sentence (1)
1)~(4).
We all know that any person has a dream while they are sleeping. We also know that it
is difficult to remember dreams after we wake up. Most dreams are soon forgotten and they
disappear like small bubbles in water. In addition, they often cannot be remembered at all
after they are forgotten. Even if you can remember a dream soon after you wake up, perhaps
you cannot remember it any more after getting out from your bed to make some coffee. Maybe
you have had such an experience.
Then, have you ever noticed that you were having a dream while you were sleeping? / Some
people have had such an experience. It is called a lucid dream, and some scientists in the world
do research on it. Actually, there are even research groups which focus on it.
Why do they do research on lucid dreams? For one thing, there may be advantages for us.
We will be able to avoid nightmares and make our dreams happier or more exciting if we can
notice we are having dreams and we can control them like a pilot. Today, scientists do not
know enough about lucid dreams and how to control them, so there are still many things to be
done in the research. But it may be possible for everyone to have lucid dreams if science in the
area improves more. Actually, that is one of goals that some scientists are trying to reach.
According to a survey, over 75% of the respondents answered that they experienced a lucid
dream at least once in their lives. Also, many reports about lucid dream experiences were given
in history. We can find early reports on them in books from ancient cultures. For example, an
ancient Greek doctor already tried to use lucid dreams as a kind of therapy over two thousand
years ago. And controlling our dreams in our own ways was one of the important topics among
early Buddhists in Asia.
