Apple Health now consolidates sleep scheduling, overnight monitoring, and long‑term analysis, using the iPhone as the hub and a compatible Apple Watch as the sensor. After enabling Sleep in the Health app, watchOS 8 or later lets you set bedtime, wake‑time, and optional Wind Down or Focus mode reminders. The system then syncs the schedule to the watch automatically.

To record sleep, the watch must stay on overnight with at least 30 % battery; otherwise it prompts a charge. Activating Sleep Focus ties monitoring to your schedule, while the accelerometer and heart‑rate sensor detect rest periods and, on newer models, differentiate REM, core, and deep stages. Siri on SE 3 or later can answer queries like “how much sleep did I get?”

Open the Health app, tap Browse → Sleep, and a top‑level chart shows last night’s duration. Drilling down reveals time in bed, total sleep, and stage breakdowns, while weekly, monthly, or six‑month views expose consistency trends. You can manually add or edit entries and manage data sources, turning raw metrics into a clear picture of nightly rest.