Dr. Michael Breus

Exactly, exactly.

Early birds have a certain time period in which their bodies want to sleep.

However, if they don't sleep during that period of time, their sleep is very inefficient.

Let me give you a better example of night owls.

So if I've got a night owl, their body, biology says they don't want to go to bed before about midnight.

Now, we can't tell everybody to wake up at the same time who goes to bed at midnight, and then some people are going to bed at 10, 9, 8.

So let's take a look at your friend here.

I would argue that if we knew what his or her chronotype is, and we told them which one of these swim lanes, if you will, to swim in, here's what ends up happening.

They don't need as much sleep.

This is going to sound crazy, but what happens is sleep consolidates.

A lot of people, once I get them figured out which one of their four chronotypes they are, they only require about six and a half to seven hours of sleep.

So their sleep need drops because they're within the zone of good sleep for their biology.

So what ends up happening is you don't have to change anything.

You just have to know when.

That's why the book is called The Power of When.

That's the third book.

of when to do things, right?

And so here's where it gets interesting is this chronotype works for every activity you do awake or asleep because it's based on hormones.

As an example, if you're an early person, like you said that you are, here's what has a tendency to happen.

As you're sleeping, your core body temperature begins to rise earlier than people who are a night owl.