How the Apple Watch Tracks Your Sleep (Scientific Review)

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Reference devices:

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Timestamps:
00:00 Intro
00:51 Apple Timeline
03:21 How Smartwatches Track Your Sleep
08:37 How Apple Tracks Your Sleep
11:38 Why the Apple Watch is Impressive
14:08 Major Problem
15:11 Options and Recommendations for Sleep Tracking

Have you ever wondered how your Apple Watch can tell if you're dreaming, tossing, or in deep sleep? Today, we’ll explore the science behind Apple Watch’s sleep tracking, what makes it quite different from other sleep trackers, and why that fact makes it surprising it outperforms most other devices. We'll also share scientific data showcasing that the Apple Watch is one of the best sleep trackers out there, though there are a few competitors that give it a run for its money.

The Oura ring costs around 300 dollars, but in addition to that you have to pay a 6 dollar monthly membership fee. The Whoop Strap doesn’t cost anything upfront for the device, but depending on when you buy it will likely set you back about 200 dollars a year. If you get the Eight Sleep cover, which is my favorite sleep improvement device, you are likely mostly interested in the active cooling and heating of the mattress, because if you just want sleep tracking, the price tag of about 2500 dollars is quite hefty. Fitbit is the cheapest brand in this list, and currently provides a lot of the sleep tracking without a subscription, though I am afraid that their current premium membership will take over more and more of the free features. The Apple Watch SE is among the more affordable options available. However, there’s more to sleep tracking than just your sleep stages.
Apple has historically been terrible when it comes to data presentation, with the health app being one of the worst apps for quickly viewing your most important data. Luckily, the Apple Watch has recently gotten an upgrade with iOS 18, which now features the Vitals app.

Oura Source: The Promise of Sleep: A Multi-Sensor Approach for Accurate Sleep Stage Detection Using the Oura Ring; Marco Altini

Temperature:

Sleep and heart rate:

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($30 off any new WHOOP membership)
☝Amazon Affiliate* (paid) links. Supports the channel, doesn't cost you any more!☝
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TheQuantifiedScientist

Waiting anxiously for your review of:
- Galaxy Watch 7
- Galaxy Watch Ultra
- Galaxy Ring
(Maybe in the same video)

danielmoksmann

I’m crying in my <as expensive as an apple watch ultra> Garmin watch. This data does reflect my experience. Sometimes my watch says I had restless sleep but I feel well rested. Gonna stop using the watch for sleeping.

Etb

Thank you for making such in-depth videos that are simple to understand. And kudos for putting in all the efforts behind to make it as scientifically accurate as possible.

ZeDarkLord

Very interesting stuff. I’ve used an Apple Watch for sleep tracking in the past and found it was terrible. It consistently said I got zero deep sleep, which is incorrect. I switched to a Garmin and though not perfect, the general picture looks a lot more normal. After seeing your video I’m remembering a conversation I had with Garmin about sleep where I mentioned that I move very little during sleep. He said that makes it difficult for trackers to score me and I’m thinking an Apple watch would struggle more due to its reliance on the accelerometer. Just a thought.

ervalkat

It would be great a video reviewing the 3rd party iOS apps that present your Apple Watch sleep data and correlate it against manual entries: alcohol, coffee…

mixy

So interested to see Galaxy Watch 7 with the upgraded sensors!

MrActiveservo

I love the Apple Watch, and love that it’s a great Heart rate and sleep monitor. But it is BAFFLING how bad the Apple Health app is at presenting that data. You’re basically forced to get a third party app if you want to make that data useful.

Metalmachine

I'm looking forward to watch your Galaxy Watch 7 reviews. According to Samsung Electronic, They use new bioactive sensor(They number it as bioactive sensor 3). The difference between bioactive sensor 2 & 3 is a number of LED light (I guess that LED light was increased from 4 to 8). anyway, I can't wait to watch your Galaxy watch 7 reviews and other scientific reviews.

shinheejung

Would love to see you recover this in the new watchOS update coming this September! The watch can finally track automatically without you having to set up a sleep schedule.

Ask-Ali

The Galaxy Watch7 was released.
It has been announced that the performance has improved a lot.

Please compare heart rate..etc with other smart watches

DAVIDLEE-obek