Best picks
10 smart rings and sleep trackers researched: battery, subscriptions, two-year cost, returns, privacy and what sleep studies say about accuracy. Checked October 7, 2026.
Key takeaways
- In 96 adults, the Oura Ring Gen3 scored sleep correctly 94.4% to 94.5% of the time and wake 73.0% to 74.6% of the time against lab sleep studies.[19]
- Seven consumer sleep trackers all detected sleep well, but their ability to detect wake ranged from 0.18 to 0.54.[20]
- In a randomized trial, adults with overweight who extended their sleep by about 1.2 hours a night ate about 270 fewer calories a day.[23]
- Over two years, the Oura Ring 5 with an annual membership costs about $539, more than any subscription-free ring on this list.[2]
In short: Our top researched pick is the Oura Ring 5 ($399 plus a $5.99-a-month membership), because Oura is the ring brand with the most sleep research behind it. If you would rather skip a subscription, the RingConn Gen 3 ($349) offers up to 14 days of battery with every feature included, and Samsung Galaxy phone owners get a well-matched, subscription-free ring in the Samsung Galaxy Ring (from $299.99). Whichever you choose, use it to protect your sleep, not to judge every night.
Specifications and prices are maker-stated and were checked on October 7, 2026. We research; we don’t test. If you are still deciding between a ring, a band and a watch, start with our side-by-side fitness tracker vs smart ring vs smartwatch comparison; for wrist bands chosen mainly for steps, see the best fitness trackers for weight loss. This list focuses on devices people wear to bed: rings, plus three bands and one arm strap that track sleep well enough to be worth a look. More gear guides live in our gear hub.
The picks
Every product below was on sale to U.S. buyers on the maker’s own store when we checked. We searched the U.S. Consumer Product Safety Commission’s recall database for every brand on the list; the results are in the safety section further down.
10 smart rings and sleep trackers, researched
1. Oura Ring 5
Best for The ring with the most sleep research behind the brand
- 6 to 9 days of battery
- waterproof to 100 m (IP68)
- app for iPhone and Android
Maker-stated specs
Price $399 plus $5.99 a month or $69.99 a year (checked Oct 7, 2026)
Drawback Most insights need the paid Oura Membership
2. RingConn Gen 3
Best for A ring with no subscription and a two-week battery
- Up to 14 days of battery
- charging case included
- iPhone and Android
- sizes 6 to 15
Maker-stated specs
Price $349 (checked Oct 7, 2026)
Drawback Uses its own sizing, so order the free sizing kit; no peer-reviewed sleep study of this model yet
3. Samsung Galaxy Ring
Best for Samsung Galaxy phone owners
- Up to 7 days of battery (sizes 12 and 13
- up to 6 days for smaller sizes)
- 10ATM and IP68
- sleep score, sleep stages and snore detection
Maker-stated specs
Price From $299.99 (checked Oct 7, 2026)
Drawback Needs a compatible Samsung Galaxy phone
4. RingConn Gen 2 Air
Best for The lowest-priced ring
- Up to 10 days of battery
- IP68, 100 m
- 2.5 to 4 g
- iOS 17 or later, Android 10 or later
Maker-stated specs
Price $159 (regular price $199) (checked Oct 7, 2026)
Drawback No sleep apnea monitoring, unlike RingConn's pricier rings
5. Ultrahuman Ring Pro
Best for The longest battery, with no subscription
- Up to 15 days of battery (up to 45 days with the charging case)
- water resistant to 100 m
- 3.3 to 4.8 g
Maker-stated specs
Price $479 (checked Oct 7, 2026)
Drawback The most expensive ring on the list
6. Circular Ring 2
Best for People who want an ECG reading on a ring
- Up to 7 days of battery
- water resistant to 50 m for up to 30 minutes
- 4 g titanium
Maker-stated specs
Price $349 (checked Oct 7, 2026)
Drawback Short 14-day return window, for unused rings only
7. Garmin Index Sleep Monitor
Best for Sleep tracking with nothing on your hand or wrist
- Soft upper-arm band
- up to 7 nights of battery with Pulse Ox
- 5 ATM
- sleep stages, HRV and skin temperature
Maker-stated specs
Price $169.99 (checked Oct 7, 2026)
Drawback Built for sleep, so you need another device for daytime steps
8. Fitbit Inspire 3
Best for The lowest price for sleep plus steps
- Up to 10 days of battery
- light, deep and REM sleep stages with Sleep Score
- 5 ATM
Maker-stated specs
Price $99.95 (checked Oct 7, 2026)
Drawback Needs a Google Account; uses your phone's GPS for walks
9. Fitbit Charge 6
Best for One band for sleep and outdoor walks
- 7-day battery
- built-in GPS
- sleep stages, Sleep Score and Smart Wake alarm
Maker-stated specs
Price $159.95 (checked Oct 7, 2026)
Drawback Some score breakdowns need a paid Google Health Premium plan
10. Amazfit Helio Strap Pro
Best for Active people who want a screenless strap
- Up to 11 days of battery
- 5 ATM
- sleep stages, HRV, naps and breathing quality in the free Zepp app
Maker-stated specs
Price $199.99 (checked Oct 7, 2026)
Drawback Designed mainly for training, with no screen
All 10 picks compared
| # | Pick | Best for | Key specs (maker-stated) | Price range | Last checked |
|---|---|---|---|---|---|
| 1 | Oura Ring 5 | The ring with the most sleep research behind the brand | 6 to 9 days of battery; waterproof to 100 m (IP68); app for iPhone and Android | $399 plus $5.99 a month or $69.99 a year | Oct 7, 2026 |
| 2 | RingConn Gen 3 | A ring with no subscription and a two-week battery | Up to 14 days of battery; charging case included; iPhone and Android; sizes 6 to 15 | $349 | Oct 7, 2026 |
| 3 | Samsung Galaxy Ring | Samsung Galaxy phone owners | Up to 7 days of battery (sizes 12 and 13; up to 6 days for smaller sizes); 10ATM and IP68; sleep score, sleep stages and snore detection | From $299.99 | Oct 7, 2026 |
| 4 | RingConn Gen 2 Air | The lowest-priced ring | Up to 10 days of battery; IP68, 100 m; 2.5 to 4 g; iOS 17 or later, Android 10 or later | $159 (regular price $199) | Oct 7, 2026 |
| 5 | Ultrahuman Ring Pro | The longest battery, with no subscription | Up to 15 days of battery (up to 45 days with the charging case); water resistant to 100 m; 3.3 to 4.8 g | $479 | Oct 7, 2026 |
| 6 | Circular Ring 2 | People who want an ECG reading on a ring | Up to 7 days of battery; water resistant to 50 m for up to 30 minutes; 4 g titanium | $349 | Oct 7, 2026 |
| 7 | Garmin Index Sleep Monitor | Sleep tracking with nothing on your hand or wrist | Soft upper-arm band; up to 7 nights of battery with Pulse Ox; 5 ATM; sleep stages, HRV and skin temperature | $169.99 | Oct 7, 2026 |
| 8 | Fitbit Inspire 3 | The lowest price for sleep plus steps | Up to 10 days of battery; light, deep and REM sleep stages with Sleep Score; 5 ATM | $99.95 | Oct 7, 2026 |
| 9 | Fitbit Charge 6 | One band for sleep and outdoor walks | 7-day battery; built-in GPS; sleep stages, Sleep Score and Smart Wake alarm | $159.95 | Oct 7, 2026 |
| 10 | Amazfit Helio Strap Pro | Active people who want a screenless strap | Up to 11 days of battery; 5 ATM; sleep stages, HRV, naps and breathing quality in the free Zepp app | $199.99 | Oct 7, 2026 |
Why these picks, and in this order
For gear we rank in a fixed order: safety and recalls first, then fit for the job, then maker-stated specs against the full price (including any subscription), then warranty and returns, then data privacy. Commissions never play a part. Every brand here cleared the first step: we found no recall for any current model on the list.
- Oura Ring 5 (1). The job here is sleep tracking, and Oura has the deepest published record of testing its rings against polysomnography, the lab sleep test. It also has the longest return window and a clear privacy policy. It ranks first despite the membership, which you should count in the price.
- RingConn Gen 3 (2). Strong specs for the money: up to 14 days of battery, a charging case and no subscription. It ranks below Oura because we found no peer-reviewed sleep validation of RingConn rings, and its return window is shorter.
- Samsung Galaxy Ring (3). No subscription and a fair price, with sleep stages and snore detection. It only fits people with a compatible Galaxy phone, which narrows who it suits.
- RingConn Gen 2 Air (4). The cheapest way into a ring at $159, with up to 10 days of battery. It drops the sleep apnea monitoring of RingConn’s other rings.
- Ultrahuman Ring Pro (5) and Circular Ring 2 (6). Both skip the subscription. The Ring Pro has the longest battery but the highest price; the Circular adds an ECG but has the shortest battery and a 14-day return window.
- Picks 7 to 10. Not rings, but good sleep trackers for people who don’t want one. Garmin’s arm band is made just for nights. The Fitbit bands cover sleep and daily steps at lower prices, and Amazfit’s strap suits people who train hard.
A note on Ultrahuman and the U.S. patent ruling
In 2025 the U.S. International Trade Commission ruled that Ultrahuman and RingConn rings infringed an Oura patent, and import bans took effect on October 21, 2025. RingConn then signed a patent license with Oura, so its rings stay on sale in the U.S. Ultrahuman redesigned its ring; U.S. Customs and Border Protection cleared the new Ring Pro for import in March 2026, and Ultrahuman’s U.S. store sells it. The older Ultrahuman Ring Air still appears on that store, but new units can’t be imported under the ban, so we left it off this list. Ask any seller about warranty support before buying older stock.
The real price: device plus membership
A subscription can turn the cheaper-looking ring into the more expensive one. Oura Membership costs $5.99 a month or $69.99 a year in the U.S., with a free first month for new members. Oura says the ring and app still work without it, but the insights and data you get are “much more limited.” RingConn, Ultrahuman, Circular and Amazfit all say on their product pages that no subscription is needed, and Samsung’s ring pages listed none. On the Fitbit bands, Google Health Premium is optional and unlocks extra breakdowns.
Battery life: why it matters for sleep
A sleep tracker sitting on its charger misses the night. The longer the battery, the fewer gaps in your sleep record, and the easier it is to spot a real trend. Most devices here last about a week; the RingConn Gen 3 and Ultrahuman Ring Pro stretch to two weeks.
| Item | Low | High |
|---|---|---|
| Samsung Galaxy Ring | 6 days | 7 days |
| Oura Ring 5 | 6 days | 9 days |
| Circular Ring 2 | 7 days | 7 days |
| Garmin Index Sleep Monitor | 7 days | 7 days |
| Fitbit Charge 6 | 7 days | 7 days |
| RingConn Gen 2 Air | 10 days | 10 days |
| Fitbit Inspire 3 | 10 days | 10 days |
| Amazfit Helio Strap Pro | 11 days | 11 days |
| RingConn Gen 3 | 14 days | 14 days |
| Ultrahuman Ring Pro | 15 days | 15 days |
Best-case figures. Galaxy Ring: up to 6 days for smaller sizes, 7 for sizes 12 and 13. Garmin rates the Index in nights. Ultrahuman Ring Pro: up to 45 days with its charging case.
Source: Maker product pages (ouraring.com, samsung.com, circular.xyz, garmin.com, Google Store, ringconn.com, us.amazfit.com, ultrahuman.com) (checked on October 7, 2026)
How accurate is ring sleep tracking?
Polysomnography, the overnight lab test, measures brain waves, eye movements and muscle activity. A ring or band only sees your pulse, movement and skin temperature, then estimates sleep from those. Studies that compare the two tell a consistent story: consumer devices are good at telling when you are asleep, weaker at spotting when you are awake, and least reliable on sleep stages.
Oura Ring Gen3 vs lab sleep studies (96 adults, up to 3 nights each)
- 94.4% to 94.5%sensitivity: how often the ring correctly scored sleepSvensson et al., Sleep Medicine 2024
- 73.0% to 74.6%specificity: how often it correctly scored wakeSvensson et al., Sleep Medicine 2024
- 75.5% to 90.6%accuracy for sleep stages (light sleep lowest, REM highest)Svensson et al., Sleep Medicine 2024
- 4.1 to 5.6 minhow much the ring underestimated REM sleepSvensson et al., Sleep Medicine 2024
Checked on October 7, 2026
In that study of 96 healthy Japanese adults aged 20 to 70, the Oura Ring did not differ significantly from the lab test for total sleep time, time to fall asleep, time awake after falling asleep, light sleep or deep sleep. The authors reported funding from Oura, and the ring tested was the older Gen3, so the Ring 5 has not been studied in the same way yet.
Independent work points the same way. In a U.S. Navy lab study of seven consumer sleep trackers in 34 adults, every device detected sleep well (sensitivity 0.93 or higher), but wake detection ranged widely, from 0.18 to 0.54. A one-night lab study of 35 adults found the Oura Ring Gen3, Fitbit Sense 2 and Apple Watch Series 8 all told sleep from wake with sensitivity of 95% or more; the Fitbit underestimated deep sleep by about 15 minutes. And a 2025 meta-analysis of six studies with 388 people found the Oura Ring’s total sleep time differed from lab results by about 3 minutes on average, a difference that was not statistically significant.
What independent sleep studies found
- 0.93 or highersleep detection across 7 consumer trackers, vs labChinoy et al., Sleep 2021
- 0.18 to 0.54wake detection across the same 7 trackersChinoy et al., Sleep 2021
- About 3 minaverage total-sleep-time difference, Oura vs lab (6 studies, 388 people)Khan et al., OTO Open 2025
Checked on October 7, 2026
We found no peer-reviewed lab validation of the Samsung Galaxy Ring, RingConn, Ultrahuman, Circular, Garmin Index or Amazfit Helio Strap Pro when we searched PubMed on October 7, 2026. That doesn’t mean they are inaccurate, only that the evidence isn’t published yet. The practical takeaway is the same for all of them: trust your total sleep time and your weekly trend, and treat the deep-versus-REM split as a rough guide.
Why sleep matters when you are losing weight
Sleep is one of the quieter levers in weight management. A meta-analysis of studies with more than 600,000 adults and children found that short sleepers were more likely to have obesity: the pooled odds were 1.55 times higher in adults. Those studies were mostly cross-sectional, so they can’t show that short sleep causes weight gain.
A randomized trial did test the idea directly. Researchers at the University of Chicago enrolled 80 adults with overweight who usually slept less than 6.5 hours a night. After a single sleep-hygiene counseling session, the sleep-extension group slept about 1.2 hours more per night and ate about 270 fewer calories a day than the control group, with no prescribed diet. Their energy expenditure didn’t change, so they ended up in a calorie deficit and lost weight compared with the controls.
Sleep and weight: the research
- About 1.2 hmore sleep a night after one counseling session (80 adults with overweight)Tasali et al., JAMA Internal Medicine 2022
- About 270 kcalless eaten a day by the sleep-extension group vs controlsTasali et al., JAMA Internal Medicine 2022
- 1.55pooled odds of obesity in adult short sleepers (cross-sectional studies)Cappuccio et al., Sleep 2008
Checked on October 7, 2026
That is where a sleep tracker earns its place: as a nudge toward a steadier bedtime. Sleep fits alongside the other habits that help you slim down and the habits that help keep weight off, and our guide to maintaining weight loss explains why routines like this matter most after the first months. If you are working toward a calorie deficit, better sleep may make it easier to stick with.
How to choose a smart ring or sleep tracker
- Your phone. The Galaxy Ring needs a compatible Samsung Galaxy phone. Oura and RingConn work with iPhone and Android; RingConn lists iOS 17 or Android 10 or later for the Gen 2 Air, and Fitbit lists Android 11 or iOS 16.4 or later for the Inspire 3.
- Ring or not. Rings are discreet and easy to sleep in. If rings bother you, or you lift weights and grip bars, an arm band like the Garmin Index or a wrist band may suit you better.
- Size first. Ring sizes differ between brands, and RingConn’s Gen 3 uses its own sizing. Order the maker’s sizing kit and wear the sample for a day and a night before you buy.
- Total cost. Add two years of any required membership, as in the chart above. A ring with no subscription can come out cheaper over time.
- Returns and warranty. Oura gives 30 days to return a ring bought from its store, and a 1-year warranty. RingConn and Circular give 14 days (Circular for unused rings only) and 1 year of warranty. Ultrahuman lists a 12-month warranty for new rings and 30-day returns for the Ring Air; its terms we read did not name the Ring Pro. Check the store’s current terms before you order.
- Battery. If you want an unbroken sleep record, look for 7 days or more, and charge it at the same time each week, such as while you shower.
Your sleep data and privacy
Sleep trackers collect sensitive data: heart rate, temperature, cycle tracking and, on some, location. Here is what the makers’ own privacy policies said when we read them on October 7, 2026:
- Oura (policy dated June 15, 2026) says it does not sell or rent personal information and does not use sensitive personal information for targeted advertising. You can ask for your account to be deleted.
- Ultrahuman (updated September 13, 2026) says it will never sell your data to third parties, but it may use and share de-identified or aggregated data. Deletion requests go to its support email.
- RingConn (updated November 17, 2025) says it does not sell personal data. Its store shares shopping and device data with ad platforms, and data may be stored outside your country.
- Samsung‘s U.S. privacy policy (July 20, 2026) says some of its sharing may count as a “sale” or targeted advertising under certain state laws, and offers an opt-out. Health data falls under a separate consumer health data statement that includes a right to delete it.
- Fitbit‘s privacy policy (Google) says it never sells users’ personal information. Deleted data can take up to 90 days to clear from all systems, including backups.
We could not read the full privacy policies of Circular, Garmin or Amazfit (Zepp) on the day we checked, so read them in the app before pairing. Turn off sharing you don’t need and note how to export or delete your data.
Safety and recalls
We searched the CPSC recall database on October 7, 2026 for Oura, Samsung, RingConn, Ultrahuman, Circular, Garmin, Amazfit (and its parent company Zepp) and Fitbit. We found no recall of any smart ring or of any product on this list. Fitbit has two past recalls of models not listed here: the Ionic smartwatch in March 2022 (about 1 million sold in the U.S.; the battery could overheat, with 78 U.S. reports of burns; Fitbit offered a $299 refund), and the Force wristband in 2014 (about 1 million sold; skin allergic reactions; full refund). Samsung’s recalls cover phones and appliances, including the Galaxy Note7 phone in 2016, but no wearables.
What a sleep tracker can’t do
These devices don’t diagnose sleep apnea, insomnia or any other condition, even those that show breathing or “apnea pattern” features. Circular, for example, describes its Ring 2 as a wellness device, not a medical device. Loud snoring, gasping at night or heavy daytime sleepiness are reasons to talk with a clinician, whatever your ring says. Trackers also estimate calories burned poorly, as our tracker comparison explains, so set your eating target with our TDEE calculator rather than the app’s burn number.
Finally, a score is not a verdict. Some people sleep worse when they worry about their numbers. If checking the app every morning makes you anxious, look only at the weekly view, or take a break. The habit is what helps: a regular bedtime, daylight and a daily walk, and two or more days of strength training a week.
Related gear and guides
A smart scale shows the slow weight trend that better sleep and more movement support, and our guide to tracking progress without a scale covers other ways to see change. To understand why calorie needs vary, read our metabolism guide. The full method behind every list is on our how we choose page.
Sources and last checked
Specifications, prices, availability and return terms were read on October 7, 2026 on ouraring.com and Oura support, ringconn.com, samsung.com, ultrahuman.com, circular.xyz, garmin.com and Garmin’s owner’s manual, the Google Store (Fitbit) and us.amazfit.com. Study figures come from the papers’ own abstracts on PubMed. Recall checks used the CPSC recall database the same day. Updated: first published October 2026.
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- Could my snoring or daytime tiredness be a sign of sleep apnea, and do I need a sleep test?
- How many hours of sleep should I aim for while I am trying to lose weight?
- Could any of my medications be affecting my sleep?
- Is it safe for me to wear a ring all night if my fingers swell?
- Which numbers from my tracker, if any, would be useful for you to see?
Frequently asked questions
What is the best smart ring?
Our top researched pick is the Oura Ring 5 ($399 plus $5.99 a month or $69.99 a year, checked October 7, 2026), because Oura has the most published sleep validation. The RingConn Gen 3 ($349) is the strongest pick with no subscription, and the Samsung Galaxy Ring suits Galaxy phone owners.
What is the best sleep tracker if I do not want a ring?
The Garmin Index Sleep Monitor ($169.99) is an upper-arm band made for sleep. The Fitbit Inspire 3 ($99.95) and Charge 6 ($159.95) track sleep stages and daily steps on the wrist.
Are smart rings accurate for sleep?
For total sleep time, fairly close. Studies of the Oura Ring found total sleep within a few minutes of lab sleep tests on average, but wake detection and sleep stages are less reliable. Most other ring brands have no published lab validation yet.
Do smart rings need a subscription?
Oura needs a membership for most insights. RingConn, Ultrahuman, Circular and Amazfit say no subscription is required, and Samsung's ring pages listed none. Check the maker's terms before buying.
Can better sleep help with weight loss?
It may help. In a randomized trial, adults with overweight who slept about 1.2 hours more a night ate about 270 fewer calories a day without a prescribed diet. Sleep works best alongside eating and activity changes.
Can a smart ring diagnose sleep apnea?
No. Consumer rings are wellness devices. Loud snoring, gasping at night or heavy daytime sleepiness are reasons to talk with a clinician about a proper sleep test.
References
- Oura Ring 5 (store page) and Oura Membership pricing. Oura. (accessed October 7, 2026) Other
- Oura Membership. Oura. (accessed October 7, 2026) Other
- Return and exchange FAQs; warranty FAQs. Oura. (accessed October 7, 2026) Other
- RingConn Gen 3 (product page). RingConn. (accessed October 7, 2026) Other
- RingConn Gen 2 Air (product page). RingConn. (accessed October 7, 2026) Other
- RingConn return and refund policy. RingConn. (accessed October 7, 2026) Other
- Galaxy Ring (product page). Samsung. (accessed October 7, 2026) Other
- Ultrahuman Ring Pro (U.S. store page). Ultrahuman. (accessed October 7, 2026) Other
- Ultrahuman Ring sales terms (U.S.). Ultrahuman. (accessed October 7, 2026) Other
- Circular Ring 2 (product page and store). Circular. (accessed October 7, 2026) Other
- Circular warranty and returns. Circular. (accessed October 7, 2026) Other
- Garmin Index Sleep Monitor (product page), owner’s manual specifications and launch release. Garmin. (accessed October 7, 2026) Other
- Fitbit Inspire 3 (Google Store product page). Google. (accessed October 7, 2026) Other
- Fitbit Charge 6 (Google Store product page). Google. (accessed October 7, 2026) Other
- Amazfit Helio Strap Pro (product page). Amazfit (Zepp Health). (accessed October 7, 2026) Other
- Ultrahuman bets on redesigned smart ring to win back US market after Oura dispute. TechCrunch, 2026. (accessed October 7, 2026) News (reported facts only)
- Oura and RingConn settle smart ring patent dispute with licensing agreement. Wareable, 2025. (accessed October 7, 2026) News (reported facts only)
- Ultrahuman gears up for US comeback with redesigned Ring Pro (CBP clearance). Android Headlines, 2026. (accessed October 7, 2026) News (reported facts only)
- Svensson T, Madhawa K, Nt H, Chung UI, Svensson AK. Validity and reliability of the Oura Ring Generation 3 (Gen3) with Oura sleep staging algorithm 2.0 (OSSA 2.0) when compared to multi-night ambulatory polysomnography: a validation study of 96 participants and 421,045 epochs. Sleep Medicine, 2024. doi:10.1016/j.sleep.2024.01.020 · PMID 38382312 (accessed October 7, 2026) Other
- Chinoy ED, Cuellar JA, Huwa KE, et al.. Performance of seven consumer sleep-tracking devices compared with polysomnography. Sleep, 2021. doi:10.1093/sleep/zsaa291 · PMID 33378539 (accessed October 7, 2026) Other
- Robbins R, Weaver MD, Sullivan JP, et al.. Accuracy of three commercial wearable devices for sleep tracking in healthy adults. Sensors, 2024. doi:10.3390/s24206532 · PMID 39460013 (accessed October 7, 2026) Other
- Khan S, Ibrahim AF, Vasudevan SS, et al.. The Oura Ring versus medical-grade sleep studies: a systematic review and meta-analysis. OTO Open, 2025. doi:10.1002/oto2.70181 · PMID 41230431 (accessed October 7, 2026) Meta-analysis
- Tasali E, Wroblewski K, Kahn E, et al.. Effect of Sleep Extension on Objectively Assessed Energy Intake Among Adults With Overweight in Real-life Settings: A Randomized Clinical Trial. JAMA Internal Medicine, 2022. doi:10.1001/jamainternmed.2021.8098 · PMID 35129580 · NCT02253368 (accessed October 7, 2026) Randomized trial
- Cappuccio FP, Taggart FM, Kandala NB, et al.. Meta-analysis of short sleep duration and obesity in children and adults. Sleep, 2008. doi:10.1093/sleep/31.5.619 · PMID 18517032 (accessed October 7, 2026) Meta-analysis
- Oura privacy policy (June 15, 2026). Oura. (accessed October 7, 2026) Other
- Ultrahuman privacy policy (updated September 13, 2026). Ultrahuman. (accessed October 7, 2026) Other
- RingConn privacy policy (updated November 17, 2025). RingConn. (accessed October 7, 2026) Other
- Samsung U.S. privacy policy (July 20, 2026) and Consumer Health Data Privacy Statement. Samsung. (accessed October 7, 2026) Other
- Fitbit privacy policy. Google. (accessed October 7, 2026) Other
- Fitbit Recalls Ionic Smartwatches Due to Burn Hazard; One Million Sold in the U.S.. U.S. Consumer Product Safety Commission, 2022. (accessed October 7, 2026) Government page
- Fitbit Recalls Force Activity-Tracking Wristband Due to Risk of Skin Irritation. U.S. Consumer Product Safety Commission, 2014. (accessed October 7, 2026) Government page
Facts checked on October 7, 2026
Educational information, not medical advice. Talk with a qualified healthcare professional about your own situation. In an emergency call 911.
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