WHEN SHOULD PATIENTS BE CONSIDERED FOR SLEEP STUDIES?

• Unexplained chronic persistent insomnia with excessive daytime sleepiness.
  
  
• Strong clinical suspicion of sleep apnea, narcolepsy, rem-behavior disorder, or disabling leg movement disorders.
  
  
• Unexplained erythrocytosis (high hemoglobin concentration).
  
  
• Unexplained pulmonary hypertension.
  
  
• Unexplained Hypercapnia (elevation of carbon dioxide in blood).
  
  
• Unexplained persistent morning headaches with normal CT scan.
  
  
• Patients with known sleep-related disorders who need follow assessments of effectiveness of therapies.