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The Series 10, Series 9, and Ultra 2 feature sleep apnea notifications designed for improved health monitoring. To enable this feature, go to the Health app on your iPhone, tap "Browse," and scroll down to set up sleep apnea notifications. Once set, wear your watch while you sleep, and it will inform you of any breathing disturbances measured over the night. After 30 days, you may receive a notification if signs of moderate to severe sleep apnea are detected.