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Posts tagged: Naps

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A person napping in afternoon light on a couch, the exact scenario where most smart rings misclassify sleep stages due to circadian differences
Smart RingsConsumer RightsSleep Science

The Nap Problem: Why Smart Rings Are Bad at Afternoon Sleep, and What the Science Actually Says

Most smart rings treat a 20-minute afternoon nap as either deep sleep or a complete miss. The reason is not a bug. It is a fundamental mismatch between how actigraphy guesses sleep stages and how naps actually work.

James Hoffmann James Hoffmann
Jun 7, 2026 13 min read