Tobacco use within the last 3 months.

Presence of other significant comorbid heart or lung disease

Presence of another chronic inflammatory disease, such as connective-tissue disease, inflammatory bowel disease, or active infection.

Use of systemic steroids, as defined as any prednisone use in the preceding 3 months.

Use of leukotriene antagonists or theophylline within the preceding 6 weeks.

Presence of severe or uncontrolled sinusitis, such that CPAP therapy will be difficult or uncomfortable.

History of significant claustrophobia, uncontrolled psychiatric disease, or anticipated intolerance of CPAP therapy.

Night shift workers, or other subjects with significantly altered sleep-wake cycles.

Baseline post-bronchodilator FEV1 \< 70% predicted.

Severe gastroesophageal reflux disease.

Effect of CPAP (Continuous Positive Airway Pressure) on Lung Function in Asthmatics With Sleep Apnea