Sleep tracking

Want ring-level sleep and stress insights without buying a ring?

October 28, 2026

Your Apple Watch already records heart rate, HRV, sleep stages, a Sleep Score, overnight Vitals and Training Load — and on the newest models a Readiness score. What each one is, how accurate the sleep and HRV data are, what the watch leaves unexplained, and whether you need another device to read it.

Already have an Apple Watch? What it measures and what it doesn't explain

October 28, 2026

Illustration of a night sky over dark blue hills, with pink-lit clouds and a thin crescent moon.

When tracking makes it worse: orthosomnia and chronic illness

October 6, 2026

Wrist temperature on Apple Watch: what the number actually measures

September 24, 2026

Oura Ring vs Apple Watch: what the accuracy data shows, and whether you need a ring at all

September 24, 2026

How a Sleep Tracker Actually Works — And What It Can (and Can't) Tell You About Your Sleep

September 9, 2026

HRV during sleep: why it's measured overnight and what it reveals about your recovery

August 11, 2026

The Best Sleep Trackers, Compared: What the Accuracy Data Actually Shows

July 20, 2026