I test sleep trackers for a living — you won't find a better Prime Day deal than 15% off the Oura Ring 4

5 hours ago 1
A woman's hand with pink nails and a pink sleeve wearing silver Oura Ring 4 on index finger with Tom's Guide Prime Day logo
(Image credit: Future)

I've tested sleep trackers of all shapes and sizes this year, from top-rated smart beds like the Eight Sleep Pod 4 mattress cover, through to Garmin, Apple and Whoop wearables.

While all of these leading sleep tech brands have built great value, reliable sleep trackers, the Oura Ring is the one I always recommend to friends. Right now the Oura Ring 4 is 15% off at Amazon for Prime Day, cutting the price to less than $300.

We rarely see a discount like this at Oura, which is why this Amazon Prime Day deal is worth snapping up fast. In fact, it's one of the best Prime Day sleep deals we've seen so far.

Is the Oura Ring a reliable sleep tracker?

In short, yes, you can trust the Oura Ring's sleep reports. Covering time spent in bed vs time asleep, sleep latency, duration and efficiency, sleep stages and overall sleep quality, they'll deliver plenty of metrics for you to get stuck into.

Don't just take my word for it: a sleep-tracking study by Brigham and Women’s Hospital took the Oura Ring Gen 3, Apple Watch Series 8 and Fitbit Sense 2 to the lab to compare them against polysomnography testing (that is, the "gold standard" of sleep assessment). The researchers concluded that the Oura Ring Gen 3 performs the best with up to 10% greater accuracy, especially when it comes to differentiating sleep stages.

This study may be based on the previous generation Oura Ring, but the Ring 4 reportedly comes with upgraded sensors offering up to 120% more accuracy. So, it's safe to say you're in reliable hands with the new ring.

Plus, its sleek design means it sits comfortably on your finger through the night, and it'll last up to seven nights on a single charge.

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Eve is a PPA-accredited journalist with an MA in Magazine Journalism from Cardiff University. She is a Sleep Staff Writer at Tom’s Guide and has four years’ experience writing health features and news. She is particularly interested in the relationship between good sleep and overall health. At Tom’s Guide Eve is responsible for coverage and reviews of sleep tech and is our smart and cooling mattress specialist, focussing on brands such as Eight Sleep and Sleep Number. She also covers general mattress reviews, seeks out the best deals to produce tried-and-tested buyer's guides for sleep accessories and enjoys writing in-depth features about sleep health. She has been involved in rigorous testing procedures for mattress reviews in our Sleep Studio and has interviewed experts including sleep doctors and psychologists. When not covering sleep at Tom's Guide, Eve enjoys writing about health and fitness, food and culture. 

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