Sleep Tracking
Benchmarking Wearable Sleep Data Reliability
We analyzed sleep data from over 5,000 real-world nights across Oura, Apple Watch, Fitbit, and Garmin users. Garmin deli...
November 28, 2025
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All research articles
Here you can find all articles published by the Terra Research team. All articles consist of original findings.
Oura Ring Series
Is Consistency Actually More Important Than Intensity?
In this report, we reveal why high-step users averaging 11,500+ daily steps succeed: consistency. Their 36% activity var...
October 23, 2025
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Oura Ring Series
Which activity metrics actually matter? 28,000+ days analysed
Smart rings track five different activity metrics, but they don't always align. Drawing on nearly 28,000 days of user da...
October 9, 2025
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Oura Ring Series
Burn More Calories, Sleep Like a Log?
An analysis of 1,000+ Oura ring users examined the relationship between daily calorie expenditure and sleep metrics. Act...
October 2, 2025
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Oura Ring Series
GAMM analysis – can complexity tell us anything we don’t already know?
Based on an analysis of nearly 90,000 nights, the connection between sleep duration and next-morning HRV is minimal for...
September 25, 2025
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Oura Ring Series
Think a good HRV score follows a good night’s sleep? Think again!
Despite their perceived link, sleep and HRV are only weakly correlated. The analysis of nearly 90,000 nights showed that...
September 20, 2025
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Oura Ring Series
Descriptive HRV using Z scores
Based on an analysis of nearly 100,000 HRV records, this report reveals that most daily HRV changes are small, but large...
September 19, 2025
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Oura Ring Series
Why Mondays Might Be Your Healthiest Day: What 1,000+ Sleepers Taught Us About Recovery
At Terra, we recently ran an analysis on wearable data from over a thousand (Oura) users, focusing on two key metrics: s...
September 18, 2025
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