"Dreams (梦 ) may be more important than sleep. We all need to dream," some scientists say.
     Dreams take up about one quarter of our  time. People have several  each night. Dreams are like short films. They are usually in color. Some dreams are   old films. They come to us over and over  . That may be because the dreamer is worrying about something. Dreaming may be a way of trying to find an answer.
    Some people get new ideas  their work from dreams. They may have been   about their work all day. These thoughts can carry over into dreams.
    Sometimes, we   with a good feeling from a dream. But often we can't remember the dream. Dreams can disappear (消失)  from memory (记忆).
    Too much dreaming can be harmful (有害的). The   we sleep, the longer we dream. The mind is hard at work when we dream. That is  we may have a long sleep and still wake up tired.