Lune morphographs

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Across
  1. 3. A drug used to help sleeping
  2. 6. The moon's period of visibility
  3. 7. The small cresent-moon shaped whitish area at the bed of a fingernail or toenail
  4. 8. Is cresent-shaped, like a cresent moon
Down
  1. 1. Is of the moon
  2. 2. A cresent or half-circle
  3. 3. A cresent-moon shaped alcove
  4. 4. The point at which a spaceship in lunar orbit is furthest from the moon
  5. 5. A term for lunar month
  6. 8. A condition of insanity believed to be caused by the moon's cycle