Dreams take up about one quarter of our sleeping time．People have （66）severaldreams each night．Dreams are like short films．They are usually in color．Some dreams are like old （67）films．They come to us over and over again．That may be because the dreamer is （68）worryingabout something． Dreaming may be a way of trying to find an（69）answer．Some people get new ideas about their work （70）from dreams．They may have been thinking about their work all day．These thoughts can carry over into dreams． Sometimes we （71）wake up with a good feeling from a dream．But often we can't （72）rememberthe dream．Dreams can disappear（消失）quickly from memory． Too much dreaming can be （73）harmful．The more we sleep，the longer we dream．The mind is hard at work （74）whenwe dream．That is why we may have a long sleep and （75）stillwake up tired．
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