Why Track Your Sleep?
Sleep tracking reveals patterns you'd never notice: how alcohol affects REM sleep, why you feel groggy despite 8 hours, or how room temperature impacts deep sleep.
Best by Form Factor
Rings: Oura Ring 4 ($349)
The most comfortable sleep tracker. Accuracy rivals clinical polysomnography in independent studies. The app provides actionable readiness scores. Battery lasts 7 days.
Watches: Apple Watch Series 11 ($399)
Apple's sleep stage detection improved dramatically with watchOS 13. The blood pressure sensor adds cardiovascular context. Smart alarm wakes you during light sleep.
Bands: Whoop 5.0 ($30/month)
Subscription-based but data-rich. Strain and recovery metrics help optimize training and sleep schedules. No screen means no nighttime distractions.
Accuracy Comparison
Oura Ring 4: 87% accuracy for sleep stage detection. Apple Watch: 84%. Fitbit: 78-82%. All are sufficient for identifying trends.
Key Metrics
- Deep sleep: 15-25% of total sleep
- REM sleep: 20-25% of total sleep
- Resting heart rate: Lower = better recovery
- HRV: Higher = better balance
