What the dark sounds like

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Across
  1. 1. Something we find in the sky
  2. 5. opposite of sour
  3. 6. thinking of something in your mind
  4. 7. Taste of lemon
  5. 8. we do this to make a cake
  6. 9. What was the tree perfect for?
Down
  1. 2. To see things in your sleep
  2. 3. What did the boy feel when he touched the tree?
  3. 4. Author of 'what the dark sounds like'
  4. 5. Opposite of weak