Dr. Matt Walker

sort of composition to someone's face.

So that's a very long way of explaining the bags under the eyes.

I'm sorry, I go off on these tangents, Andrew.

So I think...

To me, the question of what is good sleep, at first, it seems to be obvious.

You can come through, again, to your partner in the morning, and they'll say, how did you sleep?

And you have an answer.

Yeah, I slept well, or I don't think I did sleep well.

So we all have some subjective sense.

But science, for the most part, science and medicine, has usually used a singular rubric, which I think is reasonable, which is quantity.

So you would hear that, okay, how much sleep do we need?

And what would that look like to be good sleep?

And the answer is it's a quantitative answer, somewhere between seven to nine hours.

Well, actually, I would answer it differently.

If someone said, how much sleep does an average person need?

I would say about 90 minutes more.

That's the answer you would give every day?

Yeah.

How much sleep do I need?

And I would say probably about 90 minutes more if you look at the average data.