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During a sleep study or polysomnogram (PSG), these instruments record these activities:

  • EEG (electroencephalogram) for brain wave activity
  • EMG (electromyogram) for muscle activity like face twitches, teeth grinding, and leg movements
  • EOG (electrooculogram) for eye movements important in determining sleep stages
  • EKG (electrocardiogram) for heart rate and rhythm
  • Nasal airflow sensor for airflow
  • Snore microphone for snoring

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