Sleep-tracker buying matrix
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Sleep tracker buying matrix.
Five options, ranked by what they're actually good at. Plus the 4 metrics that are scientifically validated vs the 6 that are mostly marketing. Buy the one that matches your goal — or skip the device entirely.
| Device | Best for | Cost | Accuracy (vs PSG) |
|---|---|---|---|
| Oura Ring (Gen 4) Ring | Long-term trends, HRV, body temperature shifts (cycle/illness signal) Weak: Sleep stage accuracy ~60-70% vs PSG. Ring slips off in some hand sizes. | $299-449 hardware $5.99/mo (required for full data) | Total sleep: ★★★★ · Stages: ★★★ · HRV: ★★★★ |
| Whoop 5.0 Strap (no display) | Athletic recovery, training-load adjustment, stress quantification Weak: Subscription-locked. No display = phone dependency. Strap discomfort for some. | Hardware free $30/mo (mandatory) | Total sleep: ★★★★ · Stages: ★★★ · HRV: ★★★★ |
| Apple Watch (S10/Ultra) Smartwatch | All-purpose. Atrial fibrillation detection. Sleep apnea screening (S10+). Weak: Battery requires charging twice daily for full sleep tracking. Bulky overnight. | $399-799 None for sleep (Fitness+ optional) | Total sleep: ★★★ · Stages: ★★★ · Apnea screen: ★★★★ |
| Fitbit Charge 6 / Sense Wristband / smartwatch | Budget entry point. SpO2 trending. Multi-day battery. Weak: Google data integration concerns. Sleep score gamification can mislead. | $159-299 Premium $9.99/mo for SpO2 + insights | Total sleep: ★★★ · Stages: ★★ · SpO2: ★★★ |
| No tracker / paper diary Pen + notebook | CBT-I sleep restriction, anxiety-driven over-tracking, cost-conscious users Weak: Subjective. Can’t catch silent issues (apnea, restless legs). | $0 None | Subjective only — but that’s often what matters clinically. |
- Total sleep duration — accurate within 15-30 min in healthy adults.
- Sleep latency — time to fall asleep, useful for CBT-I.
- Resting heart rate trend — overnight RHR is a strong recovery signal.
- HRV trend — week-over-week change tells you about autonomic stress.
- REM/Deep/Light split — wearable algorithms guess; PSG measures.
- “Sleep score” out of 100 — proprietary, not a clinical metric.
- Body temperature in absolute °F — trends okay; numbers vague.
- SpO2 single readings — oximetry on the wrist is noisy. Patterns over weeks matter.
- “Stress score” — composite. Read the inputs, not the score.
→ Whoop if you accept the subscription model. → Oura if you want passive insight without phone-dependency. Apple Watch if you already own one.
→ Apple Watch S10+ for AFib + apnea screening, or talk to your doctor about an at-home sleep study (more definitive than any wearable).
→ Paper diary or basic Fitbit.Anything more granular often increases bedtime anxiety (“orthosomnia”) and undermines the protocol.
→ Oura. Continuous skin-temp on the finger is the most accurate consumer-grade option, validated for cycle phase prediction.