Evaluation of Potential Biomarkers for Obstructive Sleep Apnea and the Effect of Positive Pressure Treatment

OSA-patients with moderate and severe OSA (n=15+15) 1. Adult, 18-75 years of age 2. Moderate (AHI 15-30) or Severe (AHI \>30) OSA that are currently untreated and planned for CPAP-treatment 3. Otherwise healthy except for well controlled hypertension since 3 month, Max BP 140/90 4. Non-smokers 5. Not pregnant 6. No medications with antioxidants 7. BMI of \<40 Controls (AHI\<5) Two groups of controls 1. Matched controls The same age, sex and BMI ± 3 and eventual hypertension. These controls should also fulfill criteria 4-6 above. 2. Healthy controls with normal BMI (19-25) These controls should also fulfill criteria 1., 4-6 above. Exclusion Criteria: * If they no not fulfil the inclusion criteria