Guides
Understanding your sleep and recovery data
Plain-English explainers with published sources. General information, not medical advice.
What affects heart rate variability (HRV)?
A plain-English guide to heart rate variability: what it is, the things commonly linked to changes in it, why comparing with other people's numbers misleads, and how to learn what moves your own.
Does alcohol affect your sleep?
What published research says about alcohol and sleep, why a nightcap can feel like it helps, and how to look at your own sleep and recovery data to see what a drink does for you.
Correlation vs cause in your health data
A plain-English explanation of why two things moving together in your health data doesn't mean one causes the other, what confounding is, and how to get closer to what really affects you.
Launching on the iPhone App Store soon
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