Mar 22, 2026Sleep

Wearable Sleep Staging: Why Deep Sleep Is Hard to Measure

Can PPG, ECG, and multisensor wearables measure deep sleep? PSG studies find useful sleep trends, uncertain N3 staging, and opaque consumer algorithms at home.

sleep stagingwearable sleep trackingdeep sleepppg sensor

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Mar 22, 2026Sleep

Oura Mindfulness RCT: Better Sleep Scores, Weak Proof

A 10-day Oura mindfulness RCT improved ring-measured sleep and HRV, but a waitlist control and wearable limits fall short of proving a physiological benefit.

mindfulnesssleep efficiencyheart rate variabilityoura ring

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Mar 22, 2026Sleep

Can Walking While Thinking Improve Deep Sleep? Early Data

A small trial found low-intensity dual-task walking raised NREM delta power in older women. What the result means—and what it cannot prove.

deep sleepnrem delta powerlow-intensity walkingcognitive engagement

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