Hypothesis: Portable sleep testing of hospitalized medical inpatients suspected of having OSA is accurate in determining the need for positive airway pressure (PAP) therapy when compared to outpatient laboratory-based polysomnography.

• Hospitalized medical inpatients referred for suspected OSA will be tested with a portable sleep apnea testing device during hospitalization.
• These patients will then undergo an outpatient laboratory-based attended polysomnography after hospital discharge.
• Results of the inpatient portable sleep apnea test will be compared to the outpatient laboratory-based polysomnography in terms of diagnostic accuracy.

Inclusion Criteria:

- Hospitalized inpatients referred for evaluation of suspected obstructive sleep apnea

Exclusion Criteria:

• Patients admitted to surgical or obstetrics/gynecology services
• Patients with certain medical conditions (altered mental status not related to respiratory failure, septicemia, unstable psychiatric disorder, narcotic abuse and prior diagnosed sleep apnea)
• Patients with certain social histories (prisoners)
• Patients unable to use CPAP (facial deformity and traumatic facial injuries).

Patients admitted to the hospital under the general medicine service referred for evaluation of suspected obstructive sleep apnea.