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I’ve been tracking my HRV for months, but I can’t make sense of the pattern. It spikes sometimes after a poor night's sleep, which contradicts everything I’ve read about recovery. Has anyone else seen their autonomic nervous system metrics behave in such a counterintuitive way?

Yep, me too. A rough sleep night, then a surprising HRV spike in the morning. It felt counterintuitive and I started doubting what the metric was telling me.

I began reading it with a longer lag—like 10 minutes after waking—and trying to view a week of data instead of a single morning. The spike still shows up, but the pattern is less dramatic.

I found caffeine and late workouts can tilt the numbers, so I stopped drawing conclusions from one outlier.

Sometimes the problem is the gear itself—the strap, skin dryness, or movement—data swings even when you feel the day was calm.

Do you think the real problem is the data quality rather than the biology?

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