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Fun-Job-4303

u/Fun-Job-4303

r/insomnia•

Apple Watch says you got 51 min deep sleep. Lab truth: 94 min. But here’s the real lie: It only detects **47.7%** of actual deep sleep

YOUR WEARABLE IS BLIND TO DEEP SLEEP
Lab Data Proof (2024 Study, 33,603 epochs)

Radar Chart: Deep Sleep Detection
Oura: 76.8% sensitivity
Fitbit: 61.8%
Apple Watch: 47.7% ← HALF

Table S4: de Zambotti et al., Sensors 2024 Device F1 Score Sensitivity Precision
Oura 0.77 76.8% 76.9%
Fitbit 0.67 61.8% 73.9%
Apple Watch 0.62 47.7% 88.3%

Apple Watch isn’t tracking — it’s guessing.”

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