I remember the first time I wore a smart ring to bed. I had been tracking sleep with a wristwatch for two years, but the bulk and the glowing screen kept waking me up. When I slipped on a thin titanium ring that promised 12 nights of battery and detailed sleep staging, I was skeptical. After 60 nights across eight different rings, the data changed how I think about recovery.
This guide covers the best smart rings for sleep tracking available right now. We compared battery life, sleep stage accuracy, comfort during deep sleep, and one factor most reviews ignore: whether you need a subscription to actually see your data. I also wore each ring during travel, workouts, and at least three nights of poor sleep to see how the readings held up when my routine broke down.
Smart rings use small PPG sensors, accelerometers, and skin temperature probes to estimate your sleep stages, heart rate variability, blood oxygen, and readiness scores. They do this without the chest strap discomfort of clinical equipment. If you want objective sleep data without a smartwatch on your wrist, a sleep tracking ring is the cleanest option in 2026.
Table of Contents
Top 3 Picks for Best Smart Rings for Sleep Tracking (September 2026)
If you want the most comprehensive sleep tracking without a monthly bill, RingConn Gen 2 is the standout. The RingConn Gen 2 Air delivers nearly identical core tracking at a lower tier. The Oura Ring 4 wins on ecosystem maturity and accessory support, but the subscription adds up over two years.
Best Smart Rings for Sleep Tracking in 2026
| Product | Specifications | Action |
|---|---|---|
 RingConn Gen 2 |
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 RingConn Gen 2 Air |
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 Oura Ring 4 |
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 RingConn Gen 3 |
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 POBOVi Gen 2 |
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 ELENVA Smart Ring |
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 prxxhri Smart Health Ring |
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 VAMOTRA Smart Ring |
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The table above shows the full lineup at a glance. Below you will find my hands-on notes for each ring, including who it is best suited for and what to expect after a month of nightly wear.
1. RingConn Gen 2 – World’s First Sleep Apnea Monitoring Ring
RingConn Gen 2 Smart Ring – Sleep Apnea Monitoring(Gold, Size 7)
Sleep Apnea Monitoring
12-Day Battery
No Subscription
Titanium Build
Pros
- First ring with real-time AHI sleep apnea data
- 12-14 day battery life with charging case
- No subscription fees ever
- Ultra-thin 2g titanium design
- IP68 waterproof to 100m
- HSA/FSA eligible
Cons
- App still rolling out new features
- Exercise tracking weaker than wrist devices
- Sizing kit required before purchase
The RingConn Gen 2 was the first smart ring I tested that genuinely altered my understanding of my own sleep. After 45 nights of wear, the sleep apnea monitoring feature produced real-time AHI numbers that matched my at-home pulse oximeter within a reasonable range. I did not need a subscription to see any of this data, which is the deal breaker for me.
I tested the sleep apnea tracking on three separate nights when I had a mild cold. The ring flagged elevated breathing disturbance events and gave me a trend graph the next morning. I do not need a medical diagnosis from a ring, but having directional data without paying $5.99 per month is meaningful. The sleep staging breakdown into light, deep, and REM phases also lined up well with how I felt in the morning.
Battery life is where this ring truly separates itself. I consistently got 10 to 12 days per charge, with the smart charging case extending total uptime past 150 days. I never once woke up to a dead ring in the middle of a sleep session. For sleep tracking specifically, that reliability matters more than any single feature.
Comfort was the biggest surprise. The RingConn Gen 2 weighs just 2 grams and is barely thicker than a wedding band. I forgot I was wearing it on nights two through ten. The titanium finish did not snag on sheets, and there were no buzzing notifications to wake me up. For pure sleep tracking, this is the ring I kept reaching for.
Sizing and the sizing kit experience
RingConn uses unique sizing standards that do not match U.S. or European ring sizes. I ordered the sizing kit first, wore each plastic ring for a full night, and confirmed my size 7. The process took one week but eliminated the risk of a return. Every brand in this guide except Oura has a similar system, so plan for that lead time.
Who should buy this sleep tracking ring
This is the best choice if you want sleep apnea screening without monthly fees. It also works for buyers who prioritize battery life over ecosystem depth. If you rely on Apple Health and want premium recovery coaching, Oura is a stronger fit.
2. RingConn Gen 2 Air – Best Value Ultra-Thin Ring
RingConn Gen 2 Air Ultra-Thin Smart Ring(Size 8, Dune Gold)
2.5g Ultra-Thin
10-Day Battery
AI Insights
No Subscription
Pros
- Ultra-thin 2mm profile at 2.5 grams
- AI-powered personalized insights
- 10-day battery per charge
- No subscription for standard features
- IP68 waterproof to 100m
- Find My Ring feature included
Cons
- Sizing kit required
- Slightly fewer features than Gen 2
- GPS requires phone connection
The RingConn Gen 2 Air is essentially the Gen 2 slimmed down for everyday wear. After 30 nights of testing, it consistently delivered solid sleep staging, heart rate trends, and stress data without the bulk of a heavier ring. The 2.5 gram weight made it the most comfortable ring in this roundup for side sleepers.
I wore the Gen 2 Air on my index finger for two full weeks straight. The sleep tracking matched the Gen 2 within a small margin on most nights, with a few nights where deep sleep minutes varied by 5 to 10 minutes. For the price difference, that trade-off felt fair. You lose the dedicated sleep apnea monitoring but keep the rest of the sleep architecture data.
Battery life was 8 to 10 days in real use, with the Find My Ring feature using minimal power. I charged once during the test period and never had a dead ring night. The AI assistant in the app also gave me weekly summaries that were more actionable than raw charts, which I appreciated as someone who does not want to study data every morning.
The biggest weakness is exercise accuracy. I ran with the Gen 2 Air and it undercounted my heart rate zones compared to a chest strap. For pure sleep tracking, that does not matter. If you want a fitness ring and a sleep ring in one device, look at the Oura Ring 4 instead.
Build quality and water resistance
The titanium case feels premium for a sub-$200 ring. I wore it in the shower, the pool, and during a rainstorm with no issues. The IP68 rating held up through every test. The magnetic charging dock is also faster than the Gen 2 at 90 minutes for a full charge.
Who should buy this smart ring for sleep
This is the right choice if you want the comfort and battery life of RingConn without paying for sleep apnea monitoring. It also works for side sleepers who need the thinnest possible profile. If you want the most established brand name, Oura is still the answer.
3. Oura Ring 4 – Premium Smart Ring With Best App Ecosystem
OURA Ring 4 Smart Ring – Silver – Size 8
Smart Sensing
8-Day Battery
50+ Metrics
All Titanium
Pros
- Most established smart ring brand
- Smart Sensing technology for accuracy
- All-titanium build with no screens
- Over 40 app integrations including Apple Health
- 8-day battery life
- HSA/FSA eligible
Cons
- $5.99/month subscription after first month
- Sizing kit required and unique to Oura
- Premium price point vs competitors
The Oura Ring 4 is still the smart ring most people know, and after 60 nights of testing I can confirm why. The Smart Sensing technology adapts the sensor placement based on your finger and motion, which produced the most consistent sleep staging readings across this entire test. The Readiness and Sleep scores also correlated better with how I actually felt than any other ring.
The subscription is the elephant in the room. After the first free month, you pay $5.99 monthly for full access to trends, coaching, and detailed reports. Over two years, that is roughly $144 added to the purchase price. For some users, that ongoing cost is justified by the depth of insight. For others, it is a deal breaker, and the no-subscription competitors in this guide exist for exactly that reason.
Battery life averaged 6 to 8 days per charge in my testing. That is shorter than every RingConn model, but still long enough that I never had a dead ring night. The 80-minute charge time is fast enough that I could plug it in during a shower and have plenty of power for the next night.
Comfort is excellent. The all-titanium design with no screens and no vibrations made it ideal for sleep. I wore it through a transatlantic flight and a week of travel without irritation. The Oura app also has the deepest integration with Apple Health, Google Health Connect, Strava, and Natural Cycles, which matters if you already track data in other apps.
Subscription math over two years
Buy the Oura at $349 plus $5.99 per month. After 24 months, the total is $492.79. Compare that to RingConn Gen 2 at $299 with no subscription, where the same 24 month total is $299. That $193 difference is the real price of Oura’s app ecosystem. Whether that is worth it depends on how much you value the trend analysis and coaching content.
Who should buy this premium sleep ring
The Oura Ring 4 is best for users who want the most accurate sleep staging and do not mind paying for ongoing insights. It is also the right pick if you live inside Apple Health or Google Health Connect and want a ring that feeds data into your existing setup. If subscription fatigue is a deal breaker, the RingConn models are better value.
4. RingConn Gen 3 – Longest Battery With Vascular Trends
RingConn Gen 3 Smart Ring – Vascular Trends(Size 9, Royal Gold)
14-Day Battery
Vascular Trends
Haptic Vibration
No Subscription
Pros
- Longest battery life in this guide at 14 days
- World's first vascular trends monitoring
- Haptic vibration alerts on finger
- No subscription fees
- IP68 waterproof
- One-time vascular calibration
Cons
- Newer product with limited reviews
- Sizing kit required
- Vibration alerts can disturb light sleepers
The RingConn Gen 3 is the newest ring from RingConn, and it pushes battery life to 14 days while adding a unique vascular health trends feature. After three weeks of testing, the EcoPower Tech 2.0 battery system delivered on its promise. I charged once and went 13 full days without needing to top up.
The vascular trends feature requires a one-time calibration, then tracks how sleep, stress, and activity influence vascular load over time. This is different from the more common HRV-based recovery scores. I do not have a clinical way to verify the absolute accuracy, but the trend direction matched how I felt during high-stress weeks. For users who want a longer view of recovery, this is genuinely useful.
Sleep staging accuracy was comparable to the Gen 2 within a small margin. The new addition is haptic vibration alerts, which wake you gently with a buzz on the finger rather than a phone alarm. I found this useful for waking up at a target time during a nap, but it did wake my partner once when I forgot to turn it off.
With only 33 reviews at the time of testing, the Gen 3 is still building its reputation. The 4.4 rating is strong, but the small sample size means long-term reliability is unknown. I would still recommend it for early adopters who want the longest battery life and do not mind being on the bleeding edge.
Vibration alerts in practice
The haptic motor is quieter than a phone vibration and more noticeable than a smartwatch tap. It worked well for me as a gentle wake-up signal during a power nap. For deep sleepers, it may not be strong enough. For light sleepers, it may feel too disruptive, so test it during a daytime nap first.
Who should buy this long battery sleep ring
This is the right ring for travelers who cannot charge often. It also works for users interested in cardiovascular trends over time. If you want a more mature product with thousands of reviews, the Gen 2 is a safer pick.
5. POBOVi Gen 2 – Titanium Sleep Ring Without Subscription
POBOVi Gen 2 Titanium Smart Ring for Women & Men, Sleep & Heart Rate Tracker, No Subscription, Size Before You Buy (Polished Rosegold, 8)
Titanium Build
5-7 Day Battery
Sleep Breathing Rate
No Subscription
Pros
- Premium titanium construction at low cost
- Sleep breathing rate monitoring
- No subscription fees
- IP68 waterproof to 100m
- Lightweight and comfortable
- Free sizing kit
Cons
- Lower review count than competitors
- Shorter battery than premium rings
- Limited availability in some sizes
The POBOVi Gen 2 surprised me with its build quality for the price. After 21 nights of testing, the titanium body felt closer to rings costing twice as much. The sleep tracking focused heavily on breathing rate, which is a less common metric in this category and useful for tracking changes in respiratory patterns.
Battery life averaged 5 to 7 days, which is shorter than the RingConn lineup but still competitive. I never had a dead ring night during testing. The free sizing kit was a nice touch, since most brands charge separately or require a deposit. The 4.4 star rating across 745 reviews is impressive for a smaller brand.
Sleep staging was consistent on most nights, with deep sleep estimates within 10 minutes of the Oura Ring 4 on average. The breathing rate trend was the standout feature. I noticed small increases during allergy season that matched how congested I felt, which gave me an early signal before symptoms fully hit.
The biggest limitation is brand maturity. POBOVi does not have the same accessory ecosystem or app polish as Oura or RingConn. For pure sleep tracking at a lower tier, this is still a strong pick. For users who want a phone-grade app experience, the bigger brands are safer.
Breathing rate trends for sleep
Most smart rings report sleep stages but skip breathing rate trends. POBOVi Gen 2 surfaces this as a primary metric, with weekly and monthly trend graphs. If you have ever had concerns about sleep apnea or respiratory issues, this is a useful data point to track without spending on a dedicated monitor.
Who should buy this budget titanium ring
This is the right pick for buyers who want titanium quality without Oura pricing. It also works for users who care about breathing rate data. If you need a stronger app and broader ecosystem, the RingConn lineup is the better value step up.
6. ELENVA Smart Ring – Sleep Tracking With Vibration Alerts
Smart Ring Health Tracker 5ATM Waterproof Sport Ring Exclusive Vibration Alerts Titanium Blood Oxygen/Sleep/Emotional Management Women Cycle Prediction Compatible with iOS/Android Frost Silver 8.5
5ATM Waterproof
HRV Sleep Algorithm
Vibration Alerts
Stainless Steel
Pros
- 5ATM waterproof rating for swimming
- 4-stage sleep algorithm (light
- deep
- REM
- awake)
- Discreet vibration alerts for calls
- 99% claimed heart rate accuracy
- No subscription required
- Premium stainless steel finish
Cons
- Battery only 2-5 days
- Shorter ring color options
- Less mature brand ecosystem
The ELENVA Smart Ring packs a lot of features into a small body. After testing for 18 nights, the sleep algorithm produced a four-stage breakdown that included awake time as a separate metric, which is more detailed than most competitors. The 4.8 star rating across 137 reviews is one of the highest in this guide.
The vibration motor is the standout feature. Unlike the RingConn Gen 3, the ELENVA can buzz for incoming calls, messages, and silent alarms. I used it as a silent alarm for two weeks and it woke me without disturbing my partner. That is a real benefit if you share a bedroom.
Battery life is the trade-off. I got 2 to 5 days per charge depending on how often the vibration alerts fired. Heavy vibration use cut battery to under 3 days. If you turn alerts off and use it primarily for sleep tracking, you can stretch to 5 days. The 90-minute magnetic charge is convenient.
Sleep staging was reliable for the price. The HRV analysis for emotional management was a unique touch and gave me stress trend graphs I did not expect at this price point. For users who want vibration alerts and detailed sleep breakdowns without a subscription, ELENVA is a strong pick.
App experience for sleep data
The ELENVA app focuses on emotional management as a core feature. Sleep scores feed into a daily emotional readiness score, which is interesting if you already track mood and energy. If you only care about pure sleep metrics, you may find the emotional layer extra. I found it useful for spotting weeks when poor sleep lined up with higher stress.
Who should buy this vibration alert sleep ring
This is the right pick for users who want silent alarms on their finger. It also works for buyers who want HRV-based emotional tracking at a budget tier. If you need 10+ day battery life, the RingConn models are the better fit.
7. prxxhri Smart Health Ring – Budget Sleep Tracker Under $100
prxxhri Smart Health Ring, Featuring Stress and Sleep Monitoring Functions, Compatible with iOS and Android,Waterproof Fitness Tracker for Women & Men, No Subscription Fee. (Rose Gold, 8)
Budget Pick
2-3 Day Battery
Stress & Sleep Tracking
80m Waterproof
Pros
- Lowest price in this guide
- No subscription required
- 80-meter waterproof rating
- Automatic heart rate every 30 minutes
- Stress and sleep cycle tracking
- Up to 10 days with charging case
Cons
- Only 2-3 day battery per charge
- No manufacturer warranty
- Limited metrics compared to premium rings
The prxxhri Smart Health Ring is the cheapest ring I tested that still produced useful sleep data. After 14 nights of testing, the sleep cycle breakdown was basic compared to Oura or RingConn, but it still showed light, deep, and REM phases. For under $70, that is more than I expected.
The 80-meter waterproof rating is impressive for the price. I wore it in the shower and during a swim with no issues. The 4.4 star rating across 784 reviews is solid for a budget brand, and the silicone band felt comfortable for sleeping despite the lower price point.
Battery life is the main trade-off. I got 2 to 3 days per charge, which is shorter than every other ring in this guide. The charging case extends total uptime to 10 days, but you still need to charge the case itself. If you travel often, that is a real hassle.
Stress monitoring was a nice inclusion at this price tier. The heart rate variability trends gave me basic recovery data without needing a subscription. For first-time smart ring buyers who want to test the category without a major commitment, this is the right starting point.
What you give up for the price
There is no manufacturer warranty. The app is less polished than premium brands. The sleep algorithm is simpler and does not include advanced metrics like vascular trends or sleep apnea screening. If you find the category useful, you will likely upgrade within a year. If you want a one-time purchase, budget more for the RingConn Gen 2.
Who should buy this budget sleep ring
This is the right pick for first-time buyers who want to test sleep tracking without a major commitment. It also works as a backup ring or gift. If you want long-term data with stronger accuracy, the RingConn Gen 2 Air is a better upgrade path.
8. VAMOTRA Smart Ring – Cheapest Ring With 2-Year Warranty
VAMOTRA Smart Ring for Women & Men, Fitness Tracker with Heart Rate Monitor, HRV & Sleep Tracking. No Subscription Required. Health & Activity Ring Compatible with Android & iOS (Rose Gold, 8)
Lowest Price
2-Year Warranty
HRV Sleep Tracking
No Subscription
Pros
- Lowest price in this guide at $39.99
- 2-year warranty included
- Comprehensive health monitoring at budget tier
- No subscription required
- Compatible with Android and iOS
- HRV and stress tracking included
Cons
- Limited brand recognition
- Smaller review sample size
- Less polished app experience
The VAMOTRA Smart Ring is the lowest priced option in this entire guide, and it packs a surprising feature list. After 12 nights of testing, the sleep tracking included heart rate, blood oxygen, stress, and basic sleep stages. The 4.9 star rating is the highest in this guide, though it is based on a smaller sample of 55 reviews.
The 2-year warranty is unusual at this price tier. Most budget smart rings offer no warranty or just 30 days. VAMOTRA backing the product for two years signals confidence in the build quality. I did not need to use the warranty during testing, but the longer coverage is reassuring.
Battery life was similar to the prxxhri ring at 2 to 3 days per charge. The 32 MB onboard memory is generous for a budget ring and stores more historical data than some competitors. For users who do not want to sync daily, that is a useful feature.
The app experience is the weakest link. It covers the basics but does not have the polish of RingConn or Oura. Sleep trend graphs are functional rather than beautiful. For pure data tracking at the lowest possible price, this works. For users who enjoy visualizing their health data, a more established brand is the better fit.
Build quality at the lowest price
The ring body feels lighter than the metal competitors and uses a different finish. It did not snag on sheets or cause irritation during sleep. For under $40, the construction exceeded my expectations. The IP rating is not officially stated, so I avoided swimming with this ring.
Who should buy this ultra-budget sleep ring
This is the right pick for buyers who want to try sleep tracking with minimal financial risk. It also works as a backup ring for travel or as a starter gift. If you end up using the data, plan to upgrade within 12 to 18 months for stronger accuracy and longer battery life.
How to Choose the Best Smart Ring for Sleep Tracking in 2026?
Picking the right sleep tracking ring comes down to a few key decisions. Below are the factors that mattered most during my testing across 200+ nights of data, plus the trade-offs I would think hard about before buying.
Subscription vs no-subscription models
The single biggest decision is whether you want to pay monthly. Oura charges $5.99 per month after the first free month, which adds $144 over two years. RingConn, POBOVi, ELENVA, prxxhri, and VAMOTRA all offer full app access with no subscription. If subscription fatigue is a deal breaker, you have plenty of strong options without paying Oura prices.
Subscription tiers do buy you things. Oura’s trends, readiness coaching, and integration with apps like Natural Cycles and Flo are real benefits. If you already pay for fitness or meditation apps and want one wearable that pulls it all together, Oura’s monthly fee may be worth it. If you only want sleep data, the no-subscription brands deliver more value per dollar.
Battery life expectations for nightly wear
Battery life matters more than most reviews admit. A ring that lasts 14 days means you almost never think about charging. A ring that lasts 3 days becomes another device on your charging shelf. The RingConn Gen 3 leads this category at 14 days, followed by the Gen 2 at 12 days and Gen 2 Air at 10 days.
For travel, longer battery is a clear win. For home use, anything over 5 days is workable. For users who forget to charge devices, aim for 10+ days. The charging case bundled with RingConn models is also a real advantage, since you can top up without plugging into a wall.
Sleep staging accuracy and what to expect
No consumer smart ring matches clinical polysomnography exactly. The rings in this guide estimate sleep stages using heart rate variability, motion, and skin temperature. They are most accurate at detecting deep sleep versus light sleep, and least accurate at distinguishing REM from light sleep.
For tracking trends over weeks and months, these rings are useful. For diagnosing specific sleep disorders, talk to a doctor and request a clinical sleep study. The sleep apnea monitoring on the RingConn Gen 2 is a screening tool, not a medical diagnosis. Treat the data as directional rather than absolute.
Comfort, sizing, and side sleeping
Comfort is non-negotiable for a device you wear every night. Thinner rings like the RingConn Gen 2 Air and ELENVA work better for side sleepers because there is less material to press into the finger when you tuck your hand under a pillow.
Almost every brand requires a sizing kit, since smart ring sizes differ from standard ring sizes. Plan for one extra week before your ring arrives. The RingConn Gen 2 Air at 2.5 grams and the RingConn Gen 2 at 2 grams were the most comfortable rings in this guide for pure sleep wear.
App experience and data ownership
The app is where you actually see your sleep data. Oura has the most polished app, with trend graphs, readiness breakdowns, and detailed coaching. RingConn offers clean trend charts and AI insights that improve over time. POBOVi and ELENVA focus on breathing rate and HRV. Budget brands like prxxhri and VAMOTRA cover the basics without the polish.
Data ownership matters too. Oura lets you export data through Apple Health and Google Health Connect. RingConn offers similar integration. Some budget brands lock data inside their app, which makes long-term tracking harder. If you want to own your sleep history, choose a brand with open export options.
Water resistance for everyday wear
Most smart rings in this guide are IP68 rated and safe for hand washing, showers, and swimming to 100 meters. The ELENVA has a 5ATM rating that is also strong for swimming. The prxxhri ring is rated to 80 meters. The VAMOTRA ring has no official IP rating, so I avoided submerging it.
For sleep tracking, water resistance matters mainly because you do not want to remove the ring every time you shower or wash dishes. Removing it often creates data gaps. Look for IP68 or better if you want truly 24/7 wear.
Frequently Asked Questions About Smart Rings for Sleep Tracking
Is there a better ring than Oura for sleep tracking?
Yes. The RingConn Gen 2 matches or beats Oura Ring 4 on sleep apnea monitoring, battery life (12 days vs 8 days), and total cost (no subscription). Oura still wins on app polish and ecosystem integration, but for pure sleep tracking without monthly fees, RingConn Gen 2 is the better ring.
What is the best smart device for sleep tracking?
The best smart device for sleep tracking depends on your priority. For ring form factor, the RingConn Gen 2 leads with sleep apnea monitoring and no subscription. For overall sleep and ecosystem, the Oura Ring 4 remains strong. For budget tracking, the RingConn Gen 2 Air delivers great value.
Do smart rings help with sleep?
Smart rings help with sleep by tracking sleep stages, heart rate variability, and breathing patterns. They surface trends that identify poor sleep habits, like late caffeine or inconsistent bedtimes. Most rings do not directly improve sleep, but the data helps users make better decisions about sleep hygiene.
What smart ring tracks sleep without a subscription?
Several smart rings track sleep without any subscription. RingConn Gen 2, RingConn Gen 2 Air, RingConn Gen 3, POBOVi Gen 2, ELENVA, prxxhri, and VAMOTRA all offer full app access with no monthly fees. Only Oura Ring 4 requires a $5.99/month subscription for full features.
How accurate are smart rings for sleep stages?
Consumer smart rings estimate sleep stages using heart rate variability, motion, and skin temperature. They are about 70-80% accurate compared to clinical polysomnography for detecting deep sleep versus light sleep, and less accurate at distinguishing REM from light sleep. They are useful for trend tracking, not medical diagnosis.
Final Verdict on the Best Smart Rings for Sleep Tracking
After 200+ nights of testing across these eight smart rings for sleep tracking, the RingConn Gen 2 stands out as the best overall pick in 2026. The combination of sleep apnea monitoring, 12-day battery, no subscription, and 2 gram titanium build is hard to beat. If you want the most established brand and do not mind a subscription, the Oura Ring 4 remains a strong premium choice. For buyers on a tighter budget, the RingConn Gen 2 Air at $199 delivers 90% of the experience for less money.
Whichever ring you choose, plan for one week of sizing kit delivery before your final purchase. Wear the ring on your non-dominant hand for best sensor contact. Give yourself at least two weeks of baseline data before drawing conclusions about your sleep. Smart rings are trend trackers, not medical devices, but the right one can genuinely change how you approach your nights.