Type 1 Diabetes and Obstructive Sleep Apnea

Inclusion Criteria:

* Age: 18 to 50 years old
* Type 1 Diabetes on insulin pump therapy and using a CGM device with an GMI (glucose management indicator) between 5.5 and 8.5% with hemoglobin in the normal range at screening
* OSA by home sleep apnea test

Exclusion Criteria:

* Regular and adherent CPAP use per clinical guidelines
* Requiring oxygen or advanced positive airway pressure modalities during sleep
* Having a 'fall-asleep' or 'near miss' accident in the past 6-months
* Shift work
* Severe hypoglycemia (≥1 episode in the past 3 months or diagnosis of hypoglycemic unawareness)
* ≥1 trip to emergency room for poor glucose management in the past 6 months
* Proliferative retinopathy
* Fasting triglycerides \>400mg/dL,
* Liver transaminases \>2 times upper limit of normal,
* Renal transplantation or serum creatinine \>1.5 mg/dL
* Anemia (hemoglobin \<13.0g/dL in men or \<11.6g/dL in women)
* Acute coronary syndrome or stroke past 6 months
* Severe hypertension (blood pressure\>180/105 mmHg)
* Any other significant health condition: unstable angina, heart failure requiring hospitalization in the past 6 months, significant heart block or arrhythmias, NYHA Class\>2, pulmonary disease with dependence on oxygen or daily use of bronchodilators, active or chronic infection, thyroid disease and other endocrine disorders (e.g. Cushing syndrome, acromegaly)
* Recent major surgery
* Major psychiatric disorder
* Subjects will also be excluded if taking medications that can confound metabolic assessments including systemic glucocorticoids, antipsychotics, thiazide diuretics, beta-blockers, daily use of aminophylline or theophylline, or use of any immunosuppressant.
* Currently pregnant or trying to get pregnant or nursing
* Smoking, alcohol or illegal drug abuse