![Samsung Galaxy Watch 8 (2025) 40mm Bluetooth Smartwatch, Cushion Design, Fitness Tracker, Sleep Coaching, Running Coach, Energy Score, Heart Rate Tracking, Silver [US Version, 2 Yr Warranty] Silver 40mm Bluetooth Watch8](https://i.shopsavvy.com/https://x.shopsavvy.com/https://m.media-amazon.com/images/I/31LaWf6wVqL._SL500_.jpg)
The Samsung Galaxy Watch 8 provides useful sleep tracking for monitoring patterns and trends, though it doesn't match clinical-grade precision. For everyday sleep awareness, it performs well.
What It Tracks
- Sleep duration and time asleep
- Sleep stages — Light, Deep, REM
- Sleep consistency over time
- Heart rate patterns overnight
- Blood oxygen (SpO2) levels
- Movement and disturbances
- Snoring (via phone microphone)
Accuracy Expectations
No smartwatch matches polysomnography (clinical sleep studies), which uses EEG brain monitoring. The Galaxy Watch 8 infers sleep stages from heart rate variability and motion—a fundamentally different approach.
Samsung's BioActive Sensor has clinical validation. Blood oxygen readings correlate within 2% of medical-grade oximeters.
Best for: Tracking sleep trends over weeks/months Less reliable for: Precise single-night sleep stage timing
Sleep Apnea Detection
The FDA-authorized sleep apnea feature:
- Monitors SpO2 across two nights (4+ hours each)
- Available for users 22+
- 82.7% sensitivity, 87.7% specificity
- Screens for moderate-to-severe OSA
- Requires Samsung phone
This is a screening tool—not a diagnosis. Consult a doctor if apnea is detected.
Tips for Better Accuracy
- Wear the watch snugly (not loose)
- Keep sensors clean
- Charge before bed if battery is low
- Maintain consistent sleep schedule
The Galaxy Watch 8 excels at revealing sleep patterns over time rather than providing absolute accuracy for individual nights.
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How we researched this
Where this comes from: this answer draws on the product's published specifications and the reviews ShopSavvy collected for it, alongside prices from 1 retailer in ShopSavvy's price data, most recently seen Jun 17, 2026.
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