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Across
  1. 4. A condition that encourages melatonin production.
  2. 7. A health condition connected with insufficient sleep.
  3. 10. A chemical messenger produced by the body.
  4. 12. The ability to focus, which insufficient sleep may harm.
  5. 14. Describes the body’s natural 24-hour cycle.
  6. 15. A regular plan for sleeping and waking.
  7. 16. A hormone that helps prepare the body for sleep.
  8. 17. A tiny brain region that controls the circadian rhythm.
  9. 18. A sleep stage associated with vivid dreams and learning.
Down
  1. 1. Information that the brain strengthens during sleep.
  2. 2. The stage of life between childhood and adulthood.
  3. 3. Forms of light, including blue light from screens.
  4. 5. Sleep stages during which the body repairs tissues.
  5. 6. The body system supported during sleep that fights illness.
  6. 8. Morning light that helps the brain become alert.
  7. 9. The ability to remember learned information.
  8. 10. The brain area containing the body’s internal clock.
  9. 11. The developmental period when melatonin release shifts later.
  10. 13. Phones and other devices that can reduce sleep time.
  11. 18. A regular pattern followed by the body’s internal clock.