Dr. Matthew Walker

And two of the pieces of metabolic detritus that that sleep system will cleanse your brain of are beta amyloid and tau protein, which are the two culprits that underlie, we believe, the Alzheimer's disease cascade.

And two of the pieces of metabolic detritus that that sleep system will cleanse your brain of are beta amyloid and tau protein, which are the two culprits that underlie, we believe, the Alzheimer's disease cascade.

And two of the pieces of metabolic detritus that that sleep system will cleanse your brain of are beta amyloid and tau protein, which are the two culprits that underlie, we believe, the Alzheimer's disease cascade.

And what's interesting is that when you are sleeping on your side, these are animal studies, they found that that cleansing system is more efficient than when you're sleeping on your back or your front. And what they did was they showed this in rats and in mice. And then I was watching this, I was at the conference, they started to show you pictures in the wild of every single animal sleeping.

And what's interesting is that when you are sleeping on your side, these are animal studies, they found that that cleansing system is more efficient than when you're sleeping on your back or your front. And what they did was they showed this in rats and in mice. And then I was watching this, I was at the conference, they started to show you pictures in the wild of every single animal sleeping.

And what's interesting is that when you are sleeping on your side, these are animal studies, they found that that cleansing system is more efficient than when you're sleeping on your back or your front. And what they did was they showed this in rats and in mice. And then I was watching this, I was at the conference, they started to show you pictures in the wild of every single animal sleeping.

What was common across all of them, no matter how they contorted their body, the common ingredient was that their head was always on one side or the other. As if that was the natural sort of tendency, the predilection of how sleep was optimally designed.

What was common across all of them, no matter how they contorted their body, the common ingredient was that their head was always on one side or the other. As if that was the natural sort of tendency, the predilection of how sleep was optimally designed.

What was common across all of them, no matter how they contorted their body, the common ingredient was that their head was always on one side or the other. As if that was the natural sort of tendency, the predilection of how sleep was optimally designed.

And they argued that the reason for that is because that's when you get greatest optimality of flow of this, what we call the glymphatic cleansing system. Now, I would say that I haven't seen strong replication of that, nor have I seen any evidence that that's true in human beings. Human beings are very odd species. Our head is tilted 90 degrees relative to many others.

And they argued that the reason for that is because that's when you get greatest optimality of flow of this, what we call the glymphatic cleansing system. Now, I would say that I haven't seen strong replication of that, nor have I seen any evidence that that's true in human beings. Human beings are very odd species. Our head is tilted 90 degrees relative to many others.

And they argued that the reason for that is because that's when you get greatest optimality of flow of this, what we call the glymphatic cleansing system. Now, I would say that I haven't seen strong replication of that, nor have I seen any evidence that that's true in human beings. Human beings are very odd species. Our head is tilted 90 degrees relative to many others.

Think about a giraffe, a donkey. Think about a dog, a cat. their head is lifted up in line with their spinal cord.

Think about a giraffe, a donkey. Think about a dog, a cat. their head is lifted up in line with their spinal cord.

Think about a giraffe, a donkey. Think about a dog, a cat. their head is lifted up in line with their spinal cord.

When we went from being quadrupeds to bipeds, one of the things that had to happen because we were walking on all fours with our head out like a dog, if you then stood up on your back legs but kept the head in that same position, all you're doing is looking, getting a very deep interest in clouds. So our head tilted down 90 degrees. And so that means that our ergonomics of the head

When we went from being quadrupeds to bipeds, one of the things that had to happen because we were walking on all fours with our head out like a dog, if you then stood up on your back legs but kept the head in that same position, all you're doing is looking, getting a very deep interest in clouds. So our head tilted down 90 degrees. And so that means that our ergonomics of the head

When we went from being quadrupeds to bipeds, one of the things that had to happen because we were walking on all fours with our head out like a dog, if you then stood up on your back legs but kept the head in that same position, all you're doing is looking, getting a very deep interest in clouds. So our head tilted down 90 degrees. And so that means that our ergonomics of the head

And the cranium may be very different to animals. So I think the jury is out. And I don't think that's any good reason for you to start worrying about, oh my goodness, I've got to get my head to the side. And if I'm not, if it's down on the pillow or I'm on my back, don't worry about that.

And the cranium may be very different to animals. So I think the jury is out. And I don't think that's any good reason for you to start worrying about, oh my goodness, I've got to get my head to the side. And if I'm not, if it's down on the pillow or I'm on my back, don't worry about that.