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Good day Richie, thank you for taking the opportunity to ask us your question about the Samsung Galaxy Watch8. Yes, the Galaxy Watch8 offers a built-in Blood Oxygen sensor that tracks levels, especially during sleep, and works with its AI to offer deep sleep analysis, including detecting signs of sleep apnea and flagging unusual drops; while it doesn't have a direct alarm, its comprehensive sleep tracking alerts you to significant breathing irregularities, prompting further health review. If you have additional questions for us, please feel free to reach out to Support. Thanks for being a faithful Samsung customer. - Debra
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