Dreams!

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Across
  1. 3. Desire or be curious to know something
  2. 4. The founder of psychoanalysis
  3. 6. Experts or specialists in psychology
  4. 8. Stop sleeping
Down
  1. 1. Investigate systematically.
  2. 2. A specialized cells transmitting nerve impulses; nerve cells.
  3. 5. Fancy imagination that takes place when one is awake
  4. 6. Giving a sense of happy satisfaction
  5. 7. To happen; take place