Sleep tracking beyond stages: what your data is really telling you
Stage percentages are the least interesting thing in your sleep data. Here's what actually matters for recovery, cognition, and long-term health.
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What we've learned running thousands of n=1 trials. What the literature actually says about sleep, stress, recovery and longevity. The honest stuff — including what doesn't work.
Stage percentages are the least interesting thing in your sleep data. Here's what actually matters for recovery, cognition, and long-term health.
The autonomic balance metric most people read wrong — what suppressed HRV is telling you, and what you can do about it.
HRV suppression, resting HR elevation, disrupted sleep — the triad that shows up 36–72h before you feel sick. What the research says.
Randomization, blinding, sample size, and what statistically significant actually means when n=you.
Not all data is equal. A practical guide to the metrics that move the needle — and the ones that create noise.
Raw numbers don't change behavior. Here's the gap between tracking and actually understanding what your body is doing.
Where to start, what to ignore, and how to avoid the obsessive dead-ends most self-trackers fall into.
Longvai handles the randomization, the statistics, and the readout. You just pick a hypothesis.