Dr. Matthew Walker

Different algorithm, and unfortunately, different site of location. So I think the reason that Oura, and I wasn't with the company when they first made the choice to go with a Ring, By the way, the other reason I like the company and the ring itself is because of the form factor. We don't put wristwatches on when we go to sleep or headbands or chest straps. We take things off.

Different algorithm, and unfortunately, different site of location. So I think the reason that Oura, and I wasn't with the company when they first made the choice to go with a Ring, By the way, the other reason I like the company and the ring itself is because of the form factor. We don't put wristwatches on when we go to sleep or headbands or chest straps. We take things off.

But rings, we're accustomed to that. So I like the form factor too, which is a low friction, no friction device. I would say though that for the Oura Ring in terms of its sensing capacity, when you get closer to the vasculature of the finger, it's more accurate than it would be necessarily on the wrist itself and the sensor.

But rings, we're accustomed to that. So I like the form factor too, which is a low friction, no friction device. I would say though that for the Oura Ring in terms of its sensing capacity, when you get closer to the vasculature of the finger, it's more accurate than it would be necessarily on the wrist itself and the sensor.

But rings, we're accustomed to that. So I like the form factor too, which is a low friction, no friction device. I would say though that for the Oura Ring in terms of its sensing capacity, when you get closer to the vasculature of the finger, it's more accurate than it would be necessarily on the wrist itself and the sensor.

So that's why, firstly, because the, so you get a better sensing location, number one. And number two, I think the algorithms are different. So that's why you'll get probably quite wildly different numbers from those two devices. But again, I think overall, sleep trackers, largely good. Two more caveats. The first is that that absolute accuracy of 75% is its absolute accuracy.

So that's why, firstly, because the, so you get a better sensing location, number one. And number two, I think the algorithms are different. So that's why you'll get probably quite wildly different numbers from those two devices. But again, I think overall, sleep trackers, largely good. Two more caveats. The first is that that absolute accuracy of 75% is its absolute accuracy.

So that's why, firstly, because the, so you get a better sensing location, number one. And number two, I think the algorithms are different. So that's why you'll get probably quite wildly different numbers from those two devices. But again, I think overall, sleep trackers, largely good. Two more caveats. The first is that that absolute accuracy of 75% is its absolute accuracy.

However, its relative accuracy is much higher.

However, its relative accuracy is much higher.

However, its relative accuracy is much higher.

Correct. You've nailed it. So don't follow nightly headlines, absolute accuracy, follow weekly trend lines, which is to say that this thing is 75% accuracy at separating all of those different categories, but it's consistently inaccurate night after night after night. So it's power is when all of a sudden you see deviations in your trend because it can't be the ring that's deviating.

Correct. You've nailed it. So don't follow nightly headlines, absolute accuracy, follow weekly trend lines, which is to say that this thing is 75% accuracy at separating all of those different categories, but it's consistently inaccurate night after night after night. So it's power is when all of a sudden you see deviations in your trend because it can't be the ring that's deviating.

Correct. You've nailed it. So don't follow nightly headlines, absolute accuracy, follow weekly trend lines, which is to say that this thing is 75% accuracy at separating all of those different categories, but it's consistently inaccurate night after night after night. So it's power is when all of a sudden you see deviations in your trend because it can't be the ring that's deviating.

It's consistent. It must be you. That's when you should pay attention.

It's consistent. It must be you. That's when you should pay attention.

It's consistent. It must be you. That's when you should pay attention.

Exactly, yeah. So whatever is changing it, it's not the ring.

Exactly, yeah. So whatever is changing it, it's not the ring.

Exactly, yeah. So whatever is changing it, it's not the ring.