In the data, Whoop (left) tracks 2 hours and 45 minutes of REM sleep. Oura (right) tracks just 45 minutes. One is classified as unusually high - and the other is unusually low. One of these devices is wrong - but both are likely wide of the mark.
Perceptions of how we sleep affect our performance. Deception studies have shown that if you tell someone they've slept less, they perform as such.
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