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Apple Watch and Garmin sleep scores can disagree because they use different scoring formulas and sensor inputs. Apple publishes fixed weights for sleep duration, bedtime consistency and interruptions; Garmin describes a score based on duration and sleep quality, informed by signals such as heart rate, heart-rate variability (HRV) and movement. Neither score is a direct, interchangeable measurement of sleep quality. Use each device to follow your own patterns over time, not to decide which watch is right after one night.
Why Apple Watch and Garmin give different sleep scores
The scores compress different estimates into a single number. Apple’s published formula assigns points to three factors, while Garmin describes a broader quality assessment that can draw on physiological signals and personal context. The companies do not publish a way to convert one brand’s score into the other’s.
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| Comparison | Apple Watch | Garmin |
|---|---|---|
| Published score inputs | Sleep duration, bedtime consistency and interruptions. | Sleep duration and sleep quality; tracking uses heart rate, HRV and movement, with age and baseline readings adding context. |
| Published point weights | Duration: 50 points; bedtime consistency: 30; interruptions: 20. The score ranges from 0 to 100. Apple Support | Garmin does not publish fixed point weights in its public explanation. Garmin’s sleep-tracking explanation |
| How the inputs are interpreted | Bedtime consistency considers when you fell asleep over the previous 13 nights. Interruptions reflect how often and how long you were awake during sleep. | Depending on the device, respiration and blood oxygen may also be tracked. The available signals and features can vary by model. |
| What the number means | An estimate based on the factors above, not a direct measurement of restorative sleep. | A 0–100 score powered by Firstbeat Analytics, described by Garmin as reflecting duration and sleep quality. |
Because the formulas differ, the same night may earn different numbers—for example, if one score responds more to schedule consistency while another incorporates physiological signals and an individual baseline. That explanation follows from the companies’ separate descriptions; neither provides a direct conversion method.
Which sleep score should you trust?
Use each score to track its own trend
Compare a watch’s scores with your own earlier nights on that same device. A change over several nights can be useful context, especially alongside your sleep schedule and how rested you feel. Don’t compare an Apple number directly with a Garmin number as if they shared a scale.
#1 Best Overall
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Rose Gold Aluminum Case with Light Blush Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31caPPnRysL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Put more weight on timing and sleep versus wake than exact stage minutes
Validation studies suggest that wearables are better at broad sleep/wake classification than at distinguishing every stage. A 2022 study in healthy adults found sleep/wake agreement of 88% for Apple Watch and 89% for Garmin, but agreement for specific stages or wake was 53% and 50%, respectively. The authors said the tested devices needed improvement in specific sleep-stage assessment. Read the 2022 validation study.
A 2025 laboratory comparison of 62 participants tested Apple Watch Series 8 and Garmin vívosmart 4 against polysomnography (PSG), a sleep-lab method that records brain activity and other signals. Multi-state sleep-stage agreement was moderate for Apple Watch Series 8 (Cohen’s κ=0.53) and fair for Garmin vívosmart 4 (κ=0.21). All devices tended to underestimate wake after sleep onset, and the Garmin model in that study had particular difficulty identifying wake periods. These results describe those tested models and study conditions; they do not establish that every Apple Watch is more accurate than every Garmin. Read the 2025 laboratory comparison.
Rank #2
![Apple Watch Series 11 [GPS 46mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - M/L. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/416RQ0rtsUL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Quiet wakefulness can be mistaken for sleep, and stage estimates can differ between devices. A stage chart is therefore an estimate, not a definitive record of exactly when you were in light, deep or REM sleep.
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Apple’s September 2023 technical paper reported sleep-detection sensitivity of 97.9% and specificity of 75.0% in its validation set. Those are Apple-reported results for its method, not a head-to-head comparison with Garmin, and the sensitivity figure does not mean that sleep stages are 97.9% accurate. Read Apple’s technical paper.
Rank #3
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Starlight Aluminum Case with Starlight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31YiTby0pOL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
The 2025 and 2022 findings concern particular devices, populations and algorithms. They do not establish a universal winner among current Apple Watch and Garmin models or software versions.
What can affect your watch’s estimates?
- Schedule: A change in when you go to sleep can affect Apple’s bedtime-consistency component.
- Awake time: Apple includes interruptions in its score. Wearables may also miss quiet wakefulness when estimating sleep and wake.
- Fit: Apple advises wearing the watch comfortably; a loose fit can register excess movement. Apple Watch fit and sleep-tracking guidance.
- Personal context and device features: Garmin says age and baseline readings add context, and some devices also track respiration and blood oxygen. Available signals vary by device.
Can a sleep score diagnose a sleep problem?
No. A consumer sleep score or stage chart should not be used to diagnose a sleep disorder. Apple says Apple Watch is not a medical device and that Respiratory Rate measurements are not intended for diagnosis or treatment. If sleep symptoms persist or concern you, discuss them with a qualified clinician rather than trying to resolve them with a score. Apple Support’s Sleep Score guidance.
Quick Recap
Best Value
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Midnight Aluminum Case with Midnight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31Gq8SToFJL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for an irregular heart rhythm, or an unusually high or low heart rate.* You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 3 is a smartwatch that can detect a hard fall or severe car crash and automatically help connect you to emergency services and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Rank #4
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Silver Aluminum Case with Purple Fog Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/41MzDafvoSL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
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