Biological Rhythms Crossword

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Across
  1. 3. The process of bringing biological rhythms into synchronisation with the environment.
  2. 5. A biological rhythm which recurs approximately every 24 hours.
  3. 8. This comes from the German word meaning 'time giver'.
  4. 10. The dominant zeitgeber in humans.
  5. 11. A gland in the brain which produces melatonin.
  6. 12. A sleep disorder involving problems with falling asleep or staying asleep.
Down
  1. 1. A biological rhythm that occurs less often than once a day.
  2. 2. The stage of sleep during which the body is paralysed except for the eyes.
  3. 4. A sleep disorder involving sudden and uncontrollable attacks of sleep.
  4. 6. A biological rhythm which occurs more often that once a day.
  5. 7. The hormone which induces sleep.
  6. 9. A sleep disorder in which a person stops breathing while asleep.