Consumer wearable devices, such as smart watches, equipped with photoplethysmography sensors can monitor heart rate and oxygen saturation, potentially helping detect sleep disorders.^1–3 In the United States, approximately 5% of women and 14% of men ages 30 to 70 years meet the diagnostic criteria for at least mild obstructive sleep apnea (OSA), which increases with age and body mass index.^1,4–6 Consumer sleep technologies have not been used to diagnose or treat sleep disorders. However, the American Academy of Sleep Medicine encourages clinicians to know the potential benefits and disadvantages of these technologies.⁷ In 2023, the US Food and Drug Administration authorized the marketing of Samsung Electronics' sleep apnea feature, a patented mobile app that uses photoplethysmography sensors within Samsung-brand smartwatches.⁸ The intent of this feature is to detect signs of moderate to severe OSA over 2 nights in adults 22 years and older without a previous sleep apnea diagnosis.⁹ This article reviews its accuracy.