Why do we dream?

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Across
  1. 2. extremely interesting
  2. 4. investigate systematically
  3. 6. facts,information, and skills
  4. 7. a particular branch of study or sphere of activity
  5. 9. important; famous
  6. 10. arousing one's curiosity
  7. 11. a series of thoughts, images, and sensations occurring in a person's mind during sleep.
  8. 12. remember
Down
  1. 1. take place; occur
  2. 3. talent, skill, or proficiency in a particular area
  3. 5. be in a state of sleep
  4. 8. frightening or unpleasant dream