Reliability of the Samsung Galaxy for the Detection of Moderate to Severe Obstructive Sleep Apnea

Inclusion Criteria:

• 22 years of age or older

• High pre-test likelihood of moderate to severe obstructive sleep apnea (OSA) basedon screening questionnaires (STOP-Bang and Epworth Sleepiness Scale); or priordiagnosis of moderate-severe OSA.

• Able to provide informed consent confirmation

Exclusion Criteria:

• Severe and/or other acute medical illnesses as determined by the Investigator, inparticular: Cardiac conditions such as Congestive Heart Failure (CHF), atrialfibrillation, Hx of Movement disorders: Parkinson's, Tremor, Lung conditions:Chronic Obstructive Pulmonary Disease (COPD), chronic bronchitis, emphysema,pulmonary fibrosis, acute episode of flu, allergies, asthma.

• Active comorbid sleep disorders, such as severe insomnia, restless legs syndrome,Periodic Leg Movement During Sleep (PLMS), narcolepsy, idiopathic hypersomnia

• Severe and/or unstable psychiatric disorders such as mood, anxiety, or psychoticdisorders

• Individual has a condition the Investigator believes would interfere with his or herability to provide informed consent, comply with the study protocol, which mightconfound the interpretation of the study results or put the person at undue risk

• Inability to use a Samsung Galaxy device for sleep tracking

• Inability to have two nights in the Stanford sleep lab.

• Participants who are pregnant

• Tattoos or scars covering the forearm area of both hands