Scope Why are we so tired?

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Across
  1. 3. Synonym for helpful
  2. 4. __________ Rhythm is the body's 24 system
  3. 7. Synonym for Scared
  4. 8. A Mental health disorder for fear
  5. 9. A hormone triggered by darkness. Makes drowsy.
Down
  1. 1. Synonym for revive
  2. 2. Synonym for interrupt
  3. 5. Antonym of regular
  4. 6. Study of Natural Science