Dr. Matt Walker

So this comes back to why it's important.

The morning type, they are in their awesome downswing of their circadian rhythm at midnight, and they are miserable.

They're desperate for sleep.

And when you put them into bed at midnight, four hours later than they would otherwise,

They are gone.

The problem is their circadian rhythm now starts to climb back up around 4.30 in the morning.

And even though they went to bed at midnight, they're probably going to wake up artificially before the eight-hour or seven-to-nine-hour completion, and they're going to be short-slept on the back end of sleep.

And you cannot get... It's almost as though... It's work.

And so I've been... And it's a struggle because of your chronotype and your circadian rhythm, which is on its wonderful piston upswing now.

Apologies for the motorsport reference, but I...

I'm obsessed.

Yeah, I can't help myself.

I'm sorry.

That's a big F1 fan, folks, just as is Peter Attia.

So anyway, the awesome upswing that you're experiencing for your circadian rhythm prevents you from sleeping in further.

But now let's reverse the table.

Let's take the evening type and I put them into bed at 9 p.m.

or 10 p.m.

when normally they will not be ready for sleep until 1 a.m.

And they're lying in bed