The department of
Wearables
Wearables track sleep stages, heart rate variability, and resting heart rate on your wrist or finger; here are reviews, accuracy notes, and field tests.
Pieces
3
Sleep Apnea
May 2026 · 4 min
What Sleep Apnea Detection on a Wrist Actually Sees
I went to bed last Tuesday with a wrist-worn accelerometer pressed against my radial artery, an oximeter clipped to my left index finger, and a vague hope that the two would disagree in interesting…
By Natalie Forsythe · Read →
Wearables
May 2026 · 10 min
I Wore Four Sleep Trackers for Six Weeks. The Cheapest One Won.
Sleep trackers are mostly measuring the same two things, and the device that did it best for me cost less than a tank of petrol. That isn't the answer I expected when I started this.
By Judith Hawthorn · Read →
Sleep Tech
April 2026 · 5 min
What Activity Trackers for Sleep Actually See (and What They Quietly Make Up)
At 7:14 a.m. your wrist tells you that you got 42 minutes of REM, 1 hour 11 minutes of deep sleep, and a readiness score of 71. You feel like garbage.
By Megan Caldwell · Read →
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