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As a sleep tracker, evidence suggests that things like Whoop, Beddit, etc work, but HRV for recovery in athletes, not so much.
https://www.uphillathlete.com/why-we-stopped-relying-on-hrv-apps/
Also at £25/month? Hard pass.
Or measure it 24/7 - although I read somewhere the majority of the whoop data is actually taken when you are asleep.