Best Smartwatch for Sleep Tracking: Accuracy That Matters
I plugged the MorePro in while I showered this morning, like I do every day, and it hit 100% before I dried off. That's the ritual. Fifteen minutes, never drops below 70%, and I've been doing it for months. But this review isn't about battery life. It's about sleep tracking, which is the feature I care about most and the one most cheap watches absolutely butcher.
I've worn a smartwatch on every run since 2019, logged over 8,000 miles, and kept a spreadsheet of which watches lie to me. The lies about steps are annoying. The lies about heart rate are dangerous. But the lies about sleep? Those are the ones that mess with your head. A watch that tells you you slept terribly when you actually slept fine will ruin your whole day. A watch that flatters you into thinking you're recovered when you're not will ruin your training cycle. I wanted to find the best smartwatch for sleep tracking under $40 that tells the truth, or at least gets close enough to trust.
Best Overall: MorePro (B0GJSXGKG8)
I'm blown away by this one. For $25, the MorePro tracks sleep stages, heart rate, blood oxygen, and it actually makes sense of it all. The app breaks down your night into light, deep, and REM sleep with a timeline that matches how I actually felt. I woke up after a rough night, checked the watch, and it showed exactly the 2 AM wake-up I remembered, plus a solid block of deep sleep early in the night. That's the kind of accuracy I expect from a chest strap, not a watch that costs less than a pizza.
The heart rate sensor during sleep is the real story. I compared it against my chest strap for a week. The MorePro averaged within 2 beats per minute of the strap overnight. That's close enough for me to trust the recovery score it calculates when I wake up. I've had $100 watches that were off by 10 beats. For the price, this is a steal.
One thing I'll note: the band that comes with it is the standard silicone that makes my wrist sweat. I swapped it for scrunchie bands from FTYQUEE and the problem went away. The watch itself survived a week of daily wear, two runs, a shift at the garden center where I got splashed by the hose, and a nap with Gus on top of it. He's the ultimate comfort tester, and he didn't complain.
[Check price on Amazon]
Best Value: MorePro (B0GJSXGKG8)
Wait, same watch. I know. But the MorePro earns two awards because it wins two categories. At $25, it's also the best value smartwatch for sleep tracking you can buy. My friend's Garmin costs 30 times more and does maybe 10 times more. I'll take the cheap one.
The app, once you get it paired, gives you an incredible amount of health data that's easy to understand. Sleep score, breathing rate, HRV, all of it. I have no clue what half of it means, but it's cool to look at. The sleep score it gives me in the morning correlates with how I actually feel, which is the test that matters.
[Check price on Amazon]
The Premium Option: Garmin (B0CT3SGHXL)
I borrowed a friend's Garmin for two weeks. It's nice. It's also $400 plus. The sleep tracking is the most detailed I've ever seen, with body battery, stress tracking, and a readiness score that actually makes sense. The GPS is spot on, the heart rate is accurate against my chest strap, and the build quality feels like it could survive a car crash.
But here's the thing. I ran my known 5-mile course and the Garmin said 5.02 miles. The MorePro said 5.1. That's a 2% error on the cheap watch and basically zero on the Garmin. If you're doing serious zone training, that difference matters. A 4-beat heart rate error could put you in the wrong zone entirely. The Garmin doesn't have that problem.
For sleep tracking specifically, the Garmin is the gold standard. The body battery feature is genuinely useful, showing me when I'm recovered and when I'm running on fumes. But you can buy four MorePros for what this costs, and honestly, I'm not sure four times the value exists for most people. If you're a serious marathoner with a budget, get the Garmin. If you're like me and you just want to know if you slept well, save your money.
[Check price on Amazon]
The One I Wanted to Love: Apple Watch (B0FQF5BZ8Z)
I tested the Apple Watch because a friend lent me hers for a week. The sleep tracking is good, I'll give it that. The automatic sleep detection is seamless, the app integration is smooth, and the heart rate data is accurate. But it's not $400 better than the MorePro. Maybe not even $100 better.
The battery is the dealbreaker. I had to charge it every night, which means I couldn't wear it to sleep. That's a fatal flaw for a sleep tracking watch. What's the point of a sleep tracker you have to take off to charge? I charge my MorePro while I shower every morning and it never drops below 70%. The Apple Watch needs a dedicated charging session every single day.
Plus, the date format showed dd/mm even though my phone was set to mm/dd/yyyy. I'm done caring about that, but it still annoyed me. If you're already in the Apple ecosystem and you want a smartwatch that does everything, sure. But for sleep tracking specifically, you're paying for a lot of features you don't need.
[Check price on Amazon]
How I tested
I wore each watch for two weeks of daily wear. I ran my known 5-mile course with every one of them, comparing GPS traces against the marked distance I've run hundreds of times. I wore my chest strap alongside each watch for heart rate comparison, tracking the difference in beats per minute during both runs and sleep. I charged them the way I charge all my watches, plugged in while I shower every morning, and tracked battery percentage from full charge to dead.
I wore them while I watered plants at the garden center, while I ran intervals, while I slept. I paired each one with my phone and fought with the apps. I let Gus sit on them. He's a good tester. He doesn't care about specs, he just wants to know if it's comfortable enough to nap on.
Analysis and test results
Each watch was tested on sleep stage accuracy, heart rate accuracy overnight, battery life during sleep tracking, and app usability. The MorePro won on every metric that matters for the price. The Garmin was more accurate across the board, but the gap was smaller than the price gap. The Apple Watch had the best app integration and the worst battery for sleep tracking.
The MorePro's sleep staging was within 15 minutes of my actual sleep time on most nights. The Garmin was within 5. The Apple Watch was within 10. That's the kind of accuracy difference you're paying for. For most people, 15 minutes of sleep stage error doesn't matter. For a serious athlete tracking recovery, it might.
What else to consider
The budget pick: any of the $17 generic watches on Amazon. They'll track sleep, they'll give you a score, and they'll probably be wrong. I've bought three of these and they all eventually had the step counter silently stop. I'm done caring about that.
The storage king: if you want music storage on your wrist, you're looking at a different category entirely. None of these budget watches do that well, and I don't care about it anyway. If I wanted that, I'd buy an Apple Watch.
Should you buy the MorePro?
If you want a sleep tracker that tells you the truth about how you slept, and you don't want to spend more than a dinner out, yes. At $25, this is the best smartwatch for sleep tracking I've tested. It's not perfect. The app is nightmares to attach the first time. The QR code on the watch doesn't work, you have to dig through the manual. The band makes my wrist sweat something fierce until I swapped it.
But for the price, WOW. I've had watches four times the price that lied to me more than this one. I've had watches that died after three months, no trauma, just stopped charging. The MorePro has been going strong for months now. If it lasts me six months, that's about 14 cents a day. My friend's Garmin costs 30 times more and does maybe 10 times more. I'll take the cheap one.
I've bought four smartwatches in the past two years. The first was a $60 Amazon special that I accidentally submerged. Since then, I deliberately buy in the $20 to $40 range because I've learned cheap watches are disposable, and sometimes they surprise you. The MorePro surprised me. It's the one I'd wear for a marathon. It's the one I'd buy again. And it's the one I'd tell you to buy if you just want to know how you slept.